Division of the Empire (1355–1371)

Those tensions quickly hardened into open fragmentation, and from 1355 onward the empire’s politics were governed by succession, regional autonomy, and the pressure of foreign powers. In that year Ivan Alexander still acted like a ruler trying to preserve continuity: the old pattern of dynastic diplomacy with Constantinople was renewed in a fresh marriage settlement, and by the end of December a Bulgarian princess had reached the Byzantine capital, strengthening Tarnovo’s influence there even as the international situation changed around it. The political atmosphere, however, was no longer the same as in the years of Ivan Alexander’s earlier consolidation. John V Palaiologos had to struggle with the aftermath of his own civil conflicts, while Serbia was thrown into disorder by the death of Stefan Dušan in December 1355. The Serb collapse mattered for Bulgaria as much as for Byzantium, because it loosened the balance of power in the Balkans and helped create the conditions in which the Ottomans could move from raiding to holding territory.

The middle years of the decade reveal how quickly the wider Balkan world was being remade. The Turks, anchored in Europe at Gallipoli, ceased to behave merely as plunderers and began to secure cities and strong points: Didymoteichon fell to them around 1359–1361, and by 1368–1369 Adrianople was in their hands. Bulgaria, meanwhile, appears for a time to have absorbed these changes without any clearly visible state response, as though the court at Tarnovo were consumed by its own internal problems. Yet the same years also show that the Bulgarian church retained enough confidence in its own standing to resist Constantinople. Around 1361 or 1362 Patriarch Callistus addressed a sharp admonition to the Tărnovo Patriarchate, accusing it of canonical irregularities in commemoration, baptism, and the preparation of chrism. The rebuke went unanswered. That silence is telling: even as the kingdom’s political coherence was beginning to fracture, its ecclesiastical center still behaved as an independent authority, not as a subordinate community waiting for instruction.

The first direct military blows came in 1364 and 1365. In 1364 war broke out with Byzantium, and the Byzantines seized Anchialos on the Black Sea coast. The conflict did not remain a mere border quarrel for long. When John V returned from Hungary in 1366, Ivan Alexander refused him passage through Bulgarian lands, and the emperor was detained at Vidin. That decision turned a local dispute into a much wider crisis, but before it came to that, the more dramatic upheaval had already occurred in the northwest. In the last days of April 1365 the Hungarians gathered their forces, crossed the Danube near Orșova at the end of May, and on 2 June took Vidin. Ivan Sracimir was captured together with his family, the city was occupied, and a Hungarian administration was installed under Benedikt Himfi. The conquerors did not stop at the walls of the capital: they sought to control the whole Vidin principality, and they pressed their campaign with the added purpose of enforcing Catholic conversion. The royal family was carried off to captivity in the fortress of Humnik, where pressure to accept the Latin faith followed the military defeat. For a few years the western Bulgarian domain was cut off from Tarnovo and placed under foreign rule.

John V’s detention at Vidin in 1366 opened the way to an even more complicated international episode. Amadeus VI of Savoy, summoned by the Byzantine empress Anna of Savoy, appeared on the Bulgarian coast as a crusading ally against the Ottomans but became, in practice, a weapon against Bulgaria. In October 1366 his fleet seized Akhtopol, Sozopol, Sкафида, Anchialos, and Mesembria, and then advanced to Varna. The Savoyard expedition failed before the walls of Varna, but not before it had forced negotiations that involved both Ivan Alexander and the Dobruja ruler Dobrotitsa. The result was a remarkable rearrangement of coastal power: John V was finally released and allowed to continue his return, while Dobrotitsa was strengthened with control over Varna, Emona, and Koyzak, perhaps even Dristra. At the same time the abandoned Black Sea towns from Mesembria to Akhtopol passed into Byzantine hands. The compromise did not restore unity to Bulgaria; it deepened division. The coast was now split among Tarnovo, Byzantium, and the Dobruja lordship, while Vidin remained in Hungarian occupation.

The last years of Ivan Alexander’s reign were therefore marked less by recovery than by the confirmation of separation. By the time the Turks had advanced further up the Maritsa valley and taken Adrianople, the Balkans had already moved into a new phase in which the survival of local rulers depended on accommodation, tribute, and uneasy bargains. Ivan Alexander died on 17 February 1371, and the succession did not reunite the state. Ivan Shishman received the greater part of the Tarnovo domains, while Ivan Sracimir remained in control of Vidin, now effectively a second Bulgarian center rather than a subordinate appendage. In the same year Sracimir extended his own claims and seized Sofia, though only for a short time. The political map was now decisively altered: Tarnovo, Vidin, and the Dobruja coast had become separate power zones, each exposed to stronger neighbors and none able to command the whole kingdom.

The final shock of the period came with the Ottoman victory at the Maritsa on 26 September 1371. By then the Bulgarian world was already divided, and the battle only confirmed the direction in which events had been moving throughout the decade. The Bulgarian ruler who stood in the Ottoman shadow was already drawn into Murad’s sphere of vassalage, while the Serbian defeat destroyed the last major Balkan force capable of holding the Ottoman advance at bay. The years between 1355 and 1371 thus form the political prelude to the empire’s disintegration: a slow collapse of centralized authority, followed by the hardening of regional principalities, foreign occupations, and finally Ottoman ascendancy on the central Balkan road.

By the middle of the 1350s the military horizon of the Bulgarian lands had changed more sharply than their rulers could contain. The death of Stephen Dušan in 1355 and the fragmentation of Serbia removed one counterweight, while the Ottoman bridgehead in Europe, already secured at Gallipoli, transformed Thrace from a frontier of raids into a theatre of permanent conquest. The new danger did not arrive in the form of one decisive invasion, but as a series of pressures, sieges, and opportunistic strikes, in which armies were assembled quickly, marched to vulnerable points, and then used to seize towns, ports, and crossings. In this setting the Bulgarian kingdom, itself already divided into separate political centres, was forced to fight on more than one axis at once: against Byzantium on the Black Sea coast, against Hungary on the Danube, and indirectly against the advancing Ottomans whose success made every other conflict more dangerous. Warfare now revolved less around field battles than around the control of fortresses, harbours, bridges, and the routes that linked them.

The conflict with Byzantium in 1364 showed this new pattern with particular clarity. The emperor John V Palaiologos unexpectedly took the offensive against the Bulgarian Black Sea littoral, capturing Anchialos and then laying siege to Mesembria from both land and sea, with a tower erected on the landward side and ships blocking the coast. John Alexander answered by turning to forces already familiar to the Byzantines from earlier decades: the Turkish auxiliaries active in Thrace. Near Mesembria his men sent against the besiegers both his “own army” and the “barbarians in Thrace” who had been recruited with money. The episode reveals a warfare of improvisation: the Bulgarian ruler did not rely on a single standing force but on whatever contingents could be hurried together, paid, and directed against a sudden threat. Yet the campaign also exposed the fragility of this method. The Byzantines could strike at a port, threaten it by combined arms, and then leverage the result diplomatically. In the aftermath, the loss of Mesembria and Sozopolis deprived the Tărnovo centre of important coastal strongholds and made the Black Sea frontier more permeable just as the Ottoman threat in Thrace was hardening into a long-term danger.

The Hungarian occupation of Vidin in 1365 was a different kind of war: not a raid for plunder, but a deliberate campaign to seize, hold, and administer a whole territorial unit. The Hungarian army assembled in late April, marched at the beginning of May, crossed the Danube near Orshova, and reached Vidin by the end of the month. On 2 June the city itself fell, apparently after a short and decisive pressure on its walls. The operation did not stop with the capture of the capital. Hungarian forces moved to impose control over the entire domain, and an administration was installed immediately, with Benedict Himfi appointed as governor. Ivan Sratsimir and his family were taken prisoner and carried away to Humnik, where they were forced into Catholicism. This campaign displayed a level of operational organization that the Bulgarian defenders could not match: river crossing, siege, occupation, and civil administration followed one another in close sequence. It also marked the starkest military contrast of the period between the two Bulgarian centres, for the Vidin ruler was now not simply attacked by a neighbour but absorbed into a Hungarian war system that treated the town as a conquered province rather than a border prize.

The Vidin crisis then became entangled with wider diplomacy and with the strategic use of hostage-like pressure. In 1366 John V Palaiologos, on his return from Hungary, was prevented from passing through Bulgarian territory, and the detention of the emperor at Vidin transformed a local occupation into a Balkan-wide bargaining chip. Almost simultaneously the Savoyard expedition, launched not against the Turks as intended but against Bulgaria, struck the Black Sea coast with a fleet of fourteen ships. The attack was swift and maritime in character: Ahtopol, Sozopol, and Skafida fell quickly; Anchialos and Mesembria followed; only at Varna did the expedition meet resistance sufficient to halt it. Even here the Savoyards were able to seize Emona and Kozyak, and then to use their captures as leverage in negotiations that eventually brought the emperor’s release. The campaign demonstrates the importance of coastal mobility and fortification warfare in the region. The ports were vulnerable because they could be approached from the sea, while inland power could be coerced through the holding of a ruler. Bulgaria’s enemies were not acting in isolation: Hungarians, Byzantines, and Savoyards all manipulated the same military geography, exploiting the vulnerability of the coast, the Danube crossings, and the roads linking them.

Meanwhile, the Ottoman advance in Thrace created the background against which all of these campaigns unfolded. By 1359–1361 they had taken Didymoteichon; by 1363 Philippopolis fell and became a headquarters; and by 1368–1369 Adrianople itself was in their hands. These were not isolated raids but the progressive seizure of urban nodes along the Maritsa valley, converting a corridor of movement into a corridor of rule. The Ottoman method combined mobility with persistence: troops could appear in force, occupy a city, and then exploit it as a base for further pressure. The best evidence of the military logic of this expansion comes from the westward thrust that culminated in 1371. John Ugljesa and Vukasin, alarmed by the loss of the key Thracian centres, advanced with their combined armies along the road to Adrianople. Around twenty miles west of the city they encountered the Turks, whose ghazi warriors were especially dangerous when opposition was firm and direct. The engagement on the Maritsa was thus not merely another border fight, but the moment when the Ottoman way of war—mobile, aggressive, and capable of defeating divided Christian coalitions—overcame a large field army that had marched to check it. For the Bulgarian lands this meant that the conflicts of the previous decade were no longer separate episodes. The struggle for ports, river crossings, and thronelands had become part of a single military disaster unfolding across the whole peninsula, and by 1371 the division of the empire had left each Bulgarian centre exposed to enemies better able to coordinate their campaigns than the Bulgarians themselves.

By 1355–1371 the Bulgarian state was no longer a single, tightly integrated realm, yet its institutional life did not simply dissolve under the strain of division. The death of Tsar Ivan Alexander’s son and the shifting balance of power around Tarnovo, Vidin, and the Danubian and Black Sea regions produced a political map of competing centers, but the monarchy still remained the principal language of authority. Tarnovo continued to function as the axis of legitimacy, while Vidin stood out as an older and increasingly autonomous political center in the northwest, and Dobruja was ruled by a strong regional lord whose power made the northeastern lands look almost like a separate political world. In this fragmented setting, the central court did not vanish; rather, it had to govern through a denser network of negotiated loyalties, family ties, and local strongmen.

The territorial structure of rule still rested on inherited provincial units and on a vocabulary that distinguished the capital from the surrounding lands. The sources for the age of Ivan Alexander show that the state thought in terms of chora, country, land, and district, and not merely in terms of a single undifferentiated kingdom. That matters for the years after 1355, because it suggests that division at the top did not produce institutional chaos below. Even where political authority was contested, local administration retained recognizable forms, and the capital region itself seems to have enjoyed a special administrative treatment. Vidin, with its long-standing role as a northwestern center and then as the seat of a separate lordship, exemplifies the persistence of regional statehood inside the broader Bulgarian framework. Dobruja likewise was not a mere frontier zone but a territorially organized domain with its own lord and its own political rhythm.

Court and office remained tied to this territorial order. The monarchy still depended on a hierarchy of service that connected the ruler, his household, and the men who governed provinces and fortresses. Titles such as despot marked not only rank but also real political power, since a despotate could become the practical equivalent of a semi-independent principality. Around the court, the boyars remained indispensable as landholders, military supporters, and intermediaries between ruler and locality. The division of the empire did not eliminate the boyar class; it made the boyars more important, because power increasingly had to be exercised through local elites who could command men, secure fortresses, and sustain regional authority. In such circumstances, the court at Tarnovo had to preserve the appearance of supremacy even when its effective reach was uneven.

The fiscal and administrative machinery likewise showed continuity under pressure. The state’s first concern remained to secure troops, fortresses, and tax collectors wherever authority extended. This was not an abstract concern: after the Bulgarian victory at Mesembria in 1364, Ivan Alexander’s response was to send his own troops and to hire armed men in Thrace with money, a reminder that the medieval Bulgarian state now relied not only on feudal obligation but also on cash and on the organized collection of resources. The occupation of Vidin by the Hungarians in 1365 made the issue even more visible, because the conquerors immediately moved to replace the local regime with their own administration. The very speed with which an occupying power could install a governor and take over the territory shows how closely power, taxation, and military control were tied together. In Bulgarian hands, too, the holding of fortresses and the maintenance of military forces depended on access to fiscal resources and on the ability to direct them toward the frontier.

Law and jurisdiction in these years were shaped by the same combination of continuity and fragmentation. The Bulgarian state still operated through norms that were anchored in Christian kingship and in a world of written privilege, administrative routine, and ecclesiastical order. The conflict with Constantinople in 1361–1362 over ritual practice and patriarchal precedence reveals a polity that remained institutionally self-conscious: the Tarnovo church did not behave as a subordinate body waiting for approval from outside, and that confidence mirrored the political confidence of the court. Yet the very need for such disputes also shows the limits of central coherence. When the state’s borders were being pressed from the north by Hungary and from the south by the first Ottoman advances in Thrace, the machinery of rule could still function, but it functioned more unevenly, more regionally, and more dependently on local elites than before. By the time of Ivan Alexander’s death in 1371, the Bulgarian polity still possessed courts, offices, tax collection, and legal forms; what it no longer possessed was a single center capable of commanding all of them with equal force.

In the years of division after 1355, when the kingdom was increasingly pulled apart between Tarnovo, Vidin, and the Dobruja lordship, the Church remained one of the few institutions that still spoke the language of unity. The Tarnovo patriarchate did not merely survive the political fracture: it continued to act as a center of authority, memory, and Orthodox legitimacy, even as the crown struggled with war, diplomacy, and dynastic separations. The renewal of ties with Constantinople after 1355, symbolized by the new marriage arrangement between Tarnovo and the imperial city and by the presence of the Bulgarian princess in Constantinople, confirmed that ecclesiastical and dynastic relations still moved within a shared world of ritual, rank, and prestige. Yet this same shared world was now strained by the growing distance between political realities and inherited церemonial forms, and the Bulgarian Church was increasingly compelled to defend its own standing rather than simply assume it.

That tension became visible in the exchange with the patriarchate of Constantinople around 1361 or 1362. The document, addressed indirectly to the Bulgarian ecclesiastical hierarchy through monks from Tarnovo, is remarkable not only for its charges but for the very fact that it treated the Tarnovo Church as an institution capable of being reprimanded and expected to reform. Patriarch Callistus accused the Bulgarian Church of failing to commemorate the four patriarchs of the Orthodox East, of baptizing contrary to canon, and of not using holy chrism prepared in the Great Church of Hagia Sophia. In these accusations one hears the full weight of Constantinople’s universal claims, but also its frustration: the appeal was meant to correct what it presented as ignorance, and to bring the Bulgarian side back under the older hierarchy of Orthodox order. The answer, however, never came. The silence of Tarnovo was itself eloquent. It suggested not weakness, but confidence: the Bulgarian patriarchate felt secure enough in its independence to ignore a challenge that it evidently regarded as presumptuous.

The same ecclesiastical independence is visible in the way monastic figures appear as intermediaries between theological dispute and public authority. The letter from Callistus was directed through a hieromonk and a monk, whose names the manuscript leaves blank, and who were expected to influence bishops and clergy in Tarnovo. Such a procedure reveals both the respect accorded to monastic learning and the porous border between spiritual counsel and church politics. The figure usually identified with Theodosius of Tarnovo belongs to this world of influence exercised not by formal office alone, but by moral authority, ascetic reputation, and familiarity with high ecclesiastical discourse. Monasteries were not peripheral refuges in these years; they were active nodes in the circulation of texts, doctrinal positions, and cultural models. Even when the realm was increasingly divided, the monastic network helped preserve a sense of common Orthodox culture centered on the capital and its surrounding holy places.

At the same time, the literary life of the period shows that church culture in the 1350s and 1360s was not confined to polemic and administration. Around 1356, a splendid sermon or festive word associated with a scribe named Simon reveals the level of stylistic ambition cultivated in Tarnovo’s scribal milieu. Simon may not have been only a copyist, but also the author of the work itself, and he is probably identical with the Simon who copied the Four Gospels in that same year. That possibility is telling. It shows a world in which writing, copying, and authorship could belong to the same cultivated hand, and where the production of manuscripts was inseparable from literary artistry. Medieval Bulgarian prose of this kind did not strive for bare utility: it sought elevation, comparison, and rhetorical force. The learned habit of casting a figure against exempla from biblical, Byzantine, and even ancient history gave such texts a distinct brilliance, and the capital’s religious culture sustained that brilliance even as the political horizon darkened.

The monastic and bookish culture of these years was also inseparable from the visual arts. Manuscripts were made not only to be read, but to be seen; their decoration, miniatures, and ornamental frames gave theological content a physical splendor. In Tarnovo and its monasteries, the book was an object of devotion as much as a vessel of words. Such works belonged to a wider artistic environment in which church building, wall painting, and the adornment of sacred spaces remained important expressions of piety and state support. Even as the realm fractured, the capital and its monastic surroundings preserved the memory of a courtly Orthodox civilization. The anti-heretical council mentioned for the years before 1371, at which Ivan Alexander and his sons appeared together, also belongs to this same landscape: it shows a dynasty still conscious that doctrinal vigilance was part of rulership. On the eve of the catastrophe of 1371, then, Bulgarian church and letters stood as a last stronghold of continuity — intellectually confident, artistically fertile, and spiritually self-assured, though increasingly isolated from the political fragmentation that was overtaking the empire.

The division of the empire after the middle of the 1350s did not create a new economy so much as expose the different rhythms of an older one. The kingdom remained fundamentally agrarian, but the agricultural base now had to sustain three political centres whose interests and exposure to war were increasingly different: Tarnovo in the core, Vidin in the west, and Dobruja on the Black Sea littoral. This fragmentation mattered because the main routes of exchange were also the main corridors of danger. The Danubian and maritime fronts were the most vulnerable. In 1365 the Hungarian occupation of Vidin cut into the movement of goods along the river and the western frontier; in 1364 the Byzantine attack on the Black Sea coast briefly seized Anchialo and pressed Mesembria by land and sea; and in 1366 the Savoyard expedition descended on the same coast, taking one fortress after another before the siege of Varna failed. Economic life in these years therefore unfolded under pressure from campaigns, occupation, and ransom-like diplomacy, with trade, harvests, and transport repeatedly subordinated to politics and war.

Yet the countryside continued to feed both town and fortress. The kingdom’s wealth still rested on grain fields, vineyards, orchards, livestock, and the labour of villages attached to the great urban and monastic centres. Even where the narrative sources are sparse, the logic of the period is clear: the garrisons of cities such as Vidin, Mesembria, and the other coastal strongholds could only be maintained if the surrounding land remained productive enough to provide food, fodder, and draft animals. The larger towns did not stand apart from agriculture; they were embedded in it. Their markets drew on the produce of nearby districts, while their own suburban lands, gardens, and workshops formed a continuous economic belt around the walls. In a time of political split, the countryside became even more important, because each regional ruler had to draw sustenance from the lands he effectively controlled. The division of power did not weaken the agrarian character of the state; rather, it localized it.

The towns themselves remained the most active nodes of exchange and craftsmanship. Tarnovo still stood at the summit of the urban hierarchy, but Vidin, despite occupation and political upheaval, retained the weight of a Danubian centre, while the Black Sea cities — Varna, Mesembria, Anchialo, and the smaller fortified ports and capes — functioned as emporia where commerce, customs, and military defence overlapped. Urban life depended on a dense craft sector: metalworking, textile production, leather-working, carpentry, building trades, and the repair of fortifications all had to answer to the needs of war as well as to ordinary consumption. The same hands that made tools, vessels, and fabrics also supported the walls, gates, and storehouses of the cities. In this sense the economy of the divided empire was not a static rural world with a few isolated towns, but a network of fortified market places whose workshops and storerooms were constantly drawn into the service of defence. The repeated sieges of the coastal towns only underline how closely urban prosperity and military resilience were linked.

Trade continued to move along the familiar arteries — the Danube, the road network across the interior, the passages through the Balkans, and the Black Sea. What changed in the years 1355–1371 was the cost of movement and the insecurity of corridors. The western frontier was especially sensitive: the seizure of Vidin by the Hungarians in 1365 interrupted a traditional Danubian axis, while the Black Sea coast was exposed to raids, blockades, and changing loyalties among the Byzantine, Bulgarian, and Savoyard actors who operated there in 1364–1367. The existence of mobile troops, hired auxiliaries, and paid military ventures also tells its own economic story. Warfare increasingly required cash, whether to retain armed men, to secure passage, or to stabilise temporary control over fortresses. Money therefore mattered not only in the marketplace but in diplomacy and defence. The circulation of silver for wider exchange and of lower-value coin for day-to-day transactions continued to underpin commerce, even if the political division of the country made the monetary landscape more regional and uneven than before.

What the royal charters reveal is a world in which the crown still tried to regulate economic life through privilege, exemption, and protection. Charters did not merely record gifts of land; they defined the fiscal and legal environment of the estates that received them. They could free merchants or monastic dependants from customs and transit dues at roads, bridges, fords, markets, and river crossings; they could prohibit interference at gates and on the approaches to a fortified town; they could also shield persons and property from arbitrary seizure and place disputes under formal judicial procedure. In doing so, they illuminate the practical structure of the late medieval Bulgarian economy. It was an economy dense with tolls, dues, and local exactions, but also one in which royal favour could carve out islands of immunity. The very need for such clauses shows how much value attached to access routes, market rights, and the safe movement of goods and people. In a divided kingdom, privilege became a substitute for central cohesion.

Landholding in these years must be understood in the same framework. Monastic, noble, and royal holdings were not simply blocks of cultivated ground; they were complexes of rights over peasants, mills, roads, waters, and fiscal obligations. A grant of land could mean exemption from certain taxes, protection from labour services, and the confirmation of a monastery’s control over dependent villages and surrounding resources. Such arrangements reveal a state that was still bureaucratically articulate even while politically fractured. Offices concerned with taxation, local administration, and judicial supervision continued to matter because the crown still expected to extract revenue, police movement, and validate property. The division of the empire after 1355 did not abolish this system. It made it more contingent, more regional, and more dependent on negotiated privilege. Economic life in the years before 1371 was therefore marked by continuity in forms and stress in conditions: the same agrarian base, the same urban and commercial patterns, but with routes endangered, revenues fragmented, and the monarchy increasingly forced to defend the economy by granting exceptions to it.

The foreign policy of the divided empire between 1355 and 1371 unfolded in the shadow of two simultaneous transformations: Byzantium was losing the capacity to impose order on the Balkans, while the Ottoman presence in Europe was no longer a raiding nuisance but an expanding power. For Ivan Alexander, the traditional Byzantine axis did not disappear at once. In the closing months of 1355 a new marriage arrangement again linked Tarnovo and Constantinople, replacing an older and long-exhausted agreement and sending a Bulgarian princess to the imperial capital. That diplomatic move briefly preserved the familiar rhythm of dynastic exchange and influence, even as the wider political setting had changed completely. John V Palaiologos was still struggling with the remnants of the civil war, with the sons of John VI Kantakouzenos, and with the continuing need to seek help from the West. His own extraordinary turn to the papacy in 1355–1357, the sending of legates to Constantinople, and the failure of those negotiations to produce real military support, reveal how desperate Byzantine diplomacy had become. In the same years, the Balkans also saw the collapse of Serbian unity after the death of Stefan Dušan in December 1355, a disappearance that removed one of the major forces shaping the peninsula and left the region even more open to Ottoman advance.

The ecclesiastical relation between Tarnovo and Constantinople, though apparently quiet at first, was not free of tension. Around 1361 or 1362 Patriarch Kallistos of Constantinople replied to a report from Tărnovo with a forceful rebuke of Bulgarian practice, accusing the Bulgarian church of not commemorating the other patriarchs, of irregular baptismal usage, and of failing to employ the sacred chrism from the Great Church. The exchange is striking less for its practical consequences than for what it says about confidence on both sides. Constantinople still claimed universal authority; Tarnovo, in turn, felt sufficiently secure to let the letter remain unanswered. This was not merely a quarrel about liturgical detail. It marked the persistence of rivalry between two patriarchates at a moment when political order was dissolving, and it showed that the Bulgarian church, even in a divided kingdom, still acted as an independent actor in the diplomatic arena. In that sense the quarrel was one more sign that the old Byzantine framework of Balkan hierarchy had ceased to command assent.

The first direct military collision with Byzantium came in 1364, when John V launched an unexpected campaign toward the Bulgarian Black Sea coast. Anchialos fell, and Mesembria was besieged from land and sea. Ivan Alexander answered not by relying only on his own troops but by using a weapon already familiar to the Byzantines themselves: Turkish mercenaries in Thrace, hired with money. The episode is revealing. The Bulgarian ruler, who could no longer count on a stable southeastern frontier, turned to the very Ottoman milieu that had begun to dominate the region. That choice was both practical and ominous. It allowed Mesembria to resist, but it also demonstrated how thoroughly the balance of power had shifted. The conflict of 1364 was the last Bulgarian-Byzantine war, but it was already taking place under Ottoman conditions, with Christian rulers compelled to bargain with or borrow from the new force in Europe rather than confront it on equal terms.

More dangerous still for the divided empire was the Hungarian intervention in 1365. The old royal title rex Bulgariae, long a part of Hungarian political language, now turned into action. Ludwig the Great demanded Ivan Sracimir’s recognition as a Hungarian vassal; refusal brought invasion. At the end of May Hungarian forces crossed the Danube near Orșova, reached Vidin almost immediately, and on 2 June seized the capital of the northern Bulgarian domain. The occupation was systematic: a Hungarian administration was installed under Benedict Himfi, and the captured ruler, Ivan Sracimir, together with his family, was carried away and confined in Humnik, where they were also forced into Catholic observance. The taking of Vidin was not simply a frontier raid; it was an attempt to rewrite the political and confessional map of northwestern Bulgaria. It also exposed the fragility of the empire’s western flank. Vidin, already a semi-independent power center, could be treated by foreign kings as an object of direct conquest and conversion, and the central government in Tarnovo had little ability to reverse the loss quickly.

The crisis of 1366 turned the Vidin affair into a matter of international diplomacy. John V Palaiologos, returning from Buda after months of negotiations with Ludwig and with the papacy, tried to travel home overland through Bulgarian territory. Ivan Alexander refused him passage, and the emperor was detained at Vidin. The incident was politically explosive, for it turned a sovereign transit into a hostage-like standoff and invited outside intervention. In response, Amadeus VI of Savoy, who had just taken Gallipoli in a separate anti-Ottoman action, redirected his crusading fleet against the Bulgarian Black Sea coast. The campaign of October 1366 was devastating: Ahtopol, Sozopol, Skafida, Anchialos, and Mesembria fell in quick succession; Varna was besieged; and the supposed crusade became openly anti-Bulgarian. Yet the result was not simply punishment. Negotiations followed, and Dobrotitsa of Kaliakra emerged as a significant broker, dealing both with the Savoyard leader and with John V. By late December the emperor was at last released; he passed through Kaliakra and Mesembria and returned to Constantinople in the spring of 1367. In the wider settlement, the Black Sea ports taken by the Savoyards passed back to Byzantium, while Dobrotitsa appears to have strengthened his own position on the coast. The episode showed how the fragmentation of Bulgaria invited external powers to intervene not only as enemies, but as arbiters, kidnappers, and brokers in a shifting coastal diplomacy.

While these crises unfolded, the Ottoman advance kept tightening the strategic noose. Gallipoli had given the Ottomans a permanent foothold in Europe; by 1359–1361 they had taken Didymoteichon, and a few years later they were in Adrianople as well. Their pressure up the Maritsa valley, with Philippopolis taken in 1363, made every Balkan negotiation more urgent and every alliance more brittle. John V spent much of his reign trying to mobilize Venice, Genoa, Serbia, and the papacy into some kind of anti-Turkish coalition, but these efforts remained piecemeal and often self-defeating. Bulgaria, consumed by its own internal divisions and by the Vidin and Black Sea crises, did not devise a coherent response. By 1369, as the balance on the coast shifted again and the emperor reorganized Mesembria and its environs into an imperial appanage, the region’s political map had become one of competing local lords, embattled emperors, and advancing Ottoman commanders. When Ivan Alexander died in February 1371, the empire’s foreign relations had already ceased to be a single policy. They had become a set of separate and increasingly desperate accommodations, each of them made under the pressure of a wider Balkan order that was already breaking apart.

Tensions within the empire quickly turned into open divisions. From 1355 onward, the empire’s politics were shaped by struggles over who would rule next, growing independence of different regions, and pressure from foreign powers. In 1355, Ivan Alexander still acted like a ruler trying to keep things steady. He renewed the old tradition of marriage alliances with Constantinople, and by the end of December, a Bulgarian princess had arrived in the Byzantine capital. This strengthened Tarnovo’s influence there, even as the international situation was shifting. But the political climate was no longer the same as during Ivan Alexander’s earlier years of strengthening his rule. John V Palaiologos, the Byzantine emperor, was dealing with the aftermath of his own civil wars. Meanwhile, Serbia fell into chaos after the death of Stefan Dušan in December 1355. Serbia’s collapse was important for Bulgaria as well as Byzantium because it upset the balance of power in the Balkans and helped create the conditions for the Ottomans to move from raiding to actually holding land.

The middle of the decade shows how quickly the Balkans were changing. The Turks, now established in Europe at Gallipoli, stopped acting just as raiders and began capturing cities and strongholds. Didymoteichon fell to them around 1359–1361, and by 1368–1369, Adrianople was under their control. Bulgaria seemed to absorb these changes without any clear response from its government, as if the court at Tarnovo was too busy with its own problems. Still, the Bulgarian church remained confident enough to resist Constantinople’s authority. Around 1361 or 1362, Patriarch Callistus of Constantinople sharply criticized the Tarnovo Patriarchate for irregular religious practices, including how they commemorated church leaders, performed baptisms, and prepared holy oil. The Bulgarian church did not reply. This silence is significant: even as the kingdom’s political unity began to break down, its church acted independently, not as a subordinate waiting for orders.

The first direct military attacks came in 1364 and 1365. War broke out with Byzantium in 1364, and the Byzantines captured Anchialos on the Black Sea coast. The conflict soon grew beyond a simple border dispute. When John V returned from Hungary in 1366, Ivan Alexander refused to let him pass through Bulgarian lands, and the emperor was held prisoner at Vidin. This turned a local quarrel into a wider crisis. But before that, a more dramatic event happened in the northwest. At the end of April 1365, Hungarian forces gathered, crossed the Danube near Orșova by the end of May, and on June 2 took Vidin. Ivan Sracimir, the ruler there, was captured along with his family. The city was occupied, and a Hungarian administration was set up under Benedikt Himfi. The Hungarians didn’t stop at the city walls; they aimed to control the whole Vidin region and pushed their campaign with the goal of forcing Catholic conversion. The royal family was taken to the fortress of Humnik, where they faced pressure to accept the Latin (Catholic) faith after their defeat. For several years, the western Bulgarian lands were cut off from Tarnovo and ruled by foreigners.

John V’s imprisonment at Vidin in 1366 led to an even more complex international situation. Amadeus VI of Savoy, called by the Byzantine empress Anna of Savoy, arrived on the Bulgarian coast as an ally against the Ottomans. But in practice, his forces acted against Bulgaria. In October 1366, his fleet captured Akhtopol, Sozopol, Skafida, Anchialos, and Mesembria, then moved on Varna. The Savoyard expedition failed to take Varna but forced negotiations involving Ivan Alexander and Dobrotitsa, the ruler of Dobruja. The outcome was a surprising rearrangement of coastal power: John V was released and allowed to continue home, Dobrotitsa gained control over Varna, Emona, and Koyzak, possibly even Dristra, while the Black Sea towns from Mesembria to Akhtopol passed to Byzantium. This deal didn’t reunite Bulgaria; it deepened its divisions. The coast was now split among Tarnovo, Byzantium, and Dobruja, while Vidin remained under Hungarian control.

The last years of Ivan Alexander’s rule were marked more by confirmed separation than recovery. By the time the Turks had advanced further up the Maritsa valley and taken Adrianople, the Balkans had entered a new phase where local rulers survived by making deals, paying tribute, and managing uneasy alliances. Ivan Alexander died on February 17, 1371, and the succession did not reunite the empire. Ivan Shishman inherited most of the Tarnovo lands, while Ivan Sracimir stayed in control of Vidin, which had become a second Bulgarian center rather than a subordinate part. That same year, Sracimir briefly took Sofia. The political map was now clearly changed: Tarnovo, Vidin, and Dobruja had become separate power zones, each vulnerable to stronger neighbors and none able to control the whole kingdom.

The final shock came with the Ottoman victory at the Battle of Maritsa on September 26, 1371. By then, Bulgaria was already divided, and this battle only confirmed the direction things had been heading. The Bulgarian ruler was already under Ottoman influence, while the Serbian defeat destroyed the last major Balkan force able to stop the Ottoman advance. The years from 1355 to 1371 set the stage for the empire’s breakup: a slow loss of central power, the rise of regional principalities, foreign occupations, and finally Ottoman dominance along the main Balkan route.

By the mid-1350s, the military situation in Bulgarian lands had changed sharply, beyond what the rulers could control. The death of Stephen Dušan in 1355 and Serbia’s breakup removed one major counterbalance, while the Ottoman foothold in Europe at Gallipoli turned Thrace from a border of raids into an area of permanent conquest. The new threat didn’t come as one big invasion but as a series of pressures, sieges, and opportunistic attacks. Armies were quickly gathered, sent to weak spots, and used to capture towns, ports, and river crossings. Bulgaria, already divided into separate political centers, had to fight on multiple fronts: against Byzantium on the Black Sea coast, against Hungary along the Danube, and indirectly against the Ottomans, whose success made all conflicts more dangerous. Warfare now focused less on open battles and more on controlling fortresses, harbors, bridges, and the roads connecting them.

The war with Byzantium in 1364 clearly showed this new style of fighting. Emperor John V Palaiologos unexpectedly attacked the Bulgarian Black Sea coast, capturing Anchialos and then laying siege to Mesembria from both land and sea. He built a tower on the land side and blocked the coast with ships. Ivan Alexander responded by hiring Turkish mercenaries already known to the Byzantines from earlier times. Near Mesembria, his forces included both his own army and these “barbarians in Thrace,” paid with money. This shows a war fought with whatever forces could be quickly gathered and paid, rather than a standing army. But this approach was fragile. The Byzantines could strike a port, threaten it by land and sea, and then use the victory for diplomatic gain. Afterward, the loss of Mesembria and Sozopolis weakened Tarnovo’s control of the coast and made the Black Sea frontier more vulnerable just as the Ottoman threat in Thrace was growing.

The Hungarian takeover of Vidin in 1365 was a different kind of war. It wasn’t a raid for loot but a planned campaign to capture, hold, and govern a whole region. The Hungarian army gathered in late April, marched in early May, crossed the Danube near Orșova, and reached Vidin by the end of the month. On June 2, the city fell after a short siege. The Hungarians didn’t stop at the city; they moved to control the entire area and set up an administration with Benedict Himfi as governor. Ivan Sracimir and his family were taken prisoner and forced to convert to Catholicism in Humnik. This campaign showed a level of organization that the Bulgarians couldn’t match: crossing a river, besieging a city, occupying it, and setting up government all happened quickly. It also highlighted the difference between the two Bulgarian centers: Vidin was no longer just attacked by neighbors but absorbed into a Hungarian system treating it like a conquered province.

The Vidin crisis became part of wider diplomacy and hostage-like pressure. In 1366, John V Palaiologos, returning from Hungary, was stopped from passing through Bulgarian lands and held at Vidin. This turned a local occupation into a bargaining chip for the whole Balkans. At the same time, the Savoyard expedition, originally aimed at the Ottomans, attacked the Bulgarian Black Sea coast with fourteen ships. They quickly took Ahtopol, Sozopol, and Skafida; Anchialos and Mesembria soon followed. Only Varna resisted successfully. Even so, the Savoyards captured Emona and Kozyak and used these to negotiate the emperor’s release. This campaign showed the importance of coastal mobility and fortress warfare. Ports were vulnerable because enemies could attack from the sea, and inland rulers could be pressured by holding them hostage. Hungary, Byzantium, and Savoy all took advantage of the same military geography, exploiting weaknesses along the coast, Danube crossings, and roads.

Meanwhile, the Ottoman advance in Thrace provided the backdrop for all these conflicts. By 1359–1361, they had taken Didymoteichon; Philippopolis fell in 1363 and became their base; and by 1368–1369, Adrianople was theirs. These were not random raids but a steady capture of key towns along the Maritsa valley, turning a route of movement into a route of control. The Ottomans combined fast-moving troops with persistence: they could appear in force, take a city, and use it as a base for further attacks. The best example of their military strategy was the westward push that ended in 1371. John Ugljesa and Vukasin, alarmed by the loss of Thracian centers, marched with their armies toward Adrianople. About twenty miles west of the city, they met the Ottomans, whose ghazi warriors were especially dangerous when facing determined opposition. The battle on the Maritsa was not just another border fight; it was when the Ottoman style of war—fast, aggressive, and able to defeat divided Christian armies—defeated a large field army sent to stop them. For Bulgaria, this meant the conflicts of the previous decade were no longer separate events. The fight for ports, river crossings, and throne lands became one military disaster across the peninsula. By 1371, the empire’s division left each Bulgarian center vulnerable to enemies better able to coordinate their attacks.

Between 1355 and 1371, Bulgaria was no longer a single, unified state, but its institutions did not simply fall apart. The death of Ivan Alexander’s son and the shifting power around Tarnovo, Vidin, and the Danube and Black Sea regions created a political map of competing centers. Yet the monarchy remained the main symbol of authority. Tarnovo stayed the center of legitimacy, Vidin became an older but increasingly independent political center in the northwest, and Dobruja was ruled by a strong regional lord, making the northeastern lands almost a separate political world. In this divided setting, the central court did not disappear; instead, it had to rule through a complex network of negotiated loyalties, family ties, and local strongmen.

The way the state divided its territory still relied on traditional provincial units and language that distinguished the capital from surrounding lands. Sources from Ivan Alexander’s time show the state thought in terms of “chora” (country), land, and district, not just as one undivided kingdom. This matters after 1355 because it suggests that division at the top didn’t cause chaos below. Even where political control was contested, local administration kept familiar forms, and the capital region seems to have had special administrative treatment. Vidin, with its long history as a northwestern center and later as a separate lordship, shows how regional statehood continued within the broader Bulgarian framework. Dobruja was not just a border area but a territorially organized domain with its own lord and political life.

Court and government offices remained tied to this territorial order. The monarchy still depended on a hierarchy of service linking the ruler, his household, and the men governing provinces and fortresses. Titles like “despot” indicated not only rank but real political power, since a despotate could act like a semi-independent principality. Around the court, the boyars (noble landowners) stayed essential as landholders, military supporters, and links between ruler and locality. The empire’s division didn’t end the boyar class; it made them more important because power had to be exercised through local elites who controlled men, fortresses, and regional authority. In this situation, the Tarnovo court had to keep up the appearance of supremacy even when its real power was uneven.

The state’s financial and administrative systems also showed continuity despite pressure. The main concern was still to secure troops, fortresses, and tax collectors wherever authority existed. This was practical: after the Bulgarian victory at Mesembria in 1364, Ivan Alexander sent his own troops and hired armed men in Thrace with money. This shows the medieval Bulgarian state relied not only on feudal obligations but also on cash and organized resource collection. The Hungarian occupation of Vidin in 1365 made this clear because the conquerors quickly replaced the local government with their own. The speed with which an occupying power could install a governor and take control shows how closely power, taxation, and military control were linked. In Bulgarian hands, holding fortresses and maintaining armies also depended on access to money and the ability to direct it toward the frontier.

Law and justice during these years combined continuity and fragmentation. The Bulgarian state still operated through rules based on Christian kingship, written privileges, administrative routines, and church order. The conflict with Constantinople in 1361–1362 over religious practices and church rank shows a state that remained institutionally aware: the Tarnovo church did not act as a subordinate waiting for outside approval, reflecting the court’s political confidence. But the need for such disputes also reveals limits to central control. When the state’s borders were pressed from the north by Hungary and from the south by the Ottomans, the government still worked but more unevenly, more regionally, and more dependent on local elites than before. By Ivan Alexander’s death in 1371, Bulgaria still had courts, offices, tax collection, and legal systems; what it no longer had was a single center able to control all of them equally.

After 1355, as the kingdom split between Tarnovo, Vidin, and Dobruja, the Church remained one of the few institutions speaking the language of unity. The Tarnovo patriarchate not only survived the political division but continued as a center of authority, memory, and Orthodox legitimacy, even as the crown struggled with war, diplomacy, and family splits. Renewed ties with Constantinople after 1355, symbolized by the new marriage between Tarnovo and the imperial city and the Bulgarian princess’s presence in Constantinople, showed that church and dynastic relations still operated within a shared world of ritual, rank, and prestige. Yet this shared world was strained by the growing gap between political realities and traditional ceremonies. The Bulgarian Church increasingly had to defend its own status rather than simply assume it.

This tension appeared clearly in the exchange with the Constantinople patriarchate around 1361 or 1362. Patriarch Callistus sent a letter, indirectly addressed to the Bulgarian church leaders through monks from Tarnovo, accusing the Bulgarian Church of failing to commemorate the four patriarchs of the Orthodox East, of improper baptismal practices, and of not using holy oil prepared in the Great Church of Hagia Sophia. The letter shows Constantinople’s claim to universal authority but also its frustration. It aimed to correct what it saw as ignorance and bring Bulgaria back under the older Orthodox hierarchy. However, Tarnovo never replied. This silence was meaningful. It suggested not weakness but confidence: the Bulgarian patriarchate felt secure enough in its independence to ignore what it saw as an arrogant challenge.

This church independence is also seen in how monks acted as intermediaries between theological disputes and public authority. Callistus’s letter was sent through a hieromonk and a monk, whose names are unknown, who were expected to influence bishops and clergy in Tarnovo. This shows the respect given to monastic learning and the close connection between spiritual advice and church politics. The figure often identified as Theodosius of Tarnovo belonged to this world, where influence came not just from formal office but from moral authority, ascetic reputation, and knowledge of church matters. Monasteries were not isolated places; they were active centers for sharing texts, ideas, and cultural models. Even as the realm divided, the monastic network helped keep a sense of shared Orthodox culture centered on the capital and its holy sites.

At the same time, the literary life of the period shows that church culture in the 1350s and 1360s was more than just disputes and administration. Around 1356, a fine sermon or festive speech linked to a scribe named Simon shows the high level of style in Tarnovo’s scribal community. Simon may have been both the author and the copyist of this work, and he is probably the same Simon who copied the Four Gospels that year. This suggests a world where writing, copying, and authorship could come from the same skilled hand, and where making manuscripts was also an art form. Medieval Bulgarian prose didn’t aim for bare usefulness but sought to elevate, compare, and persuade. The habit of comparing figures to biblical, Byzantine, and ancient examples gave these texts a special brilliance, and Tarnovo’s religious culture kept that brilliance alive even as political troubles grew.

The monastic and literary culture was also closely tied to visual arts. Manuscripts were made not only to be read but to be admired; their decorations, miniatures, and frames gave theological content a physical beauty. In Tarnovo and its monasteries, books were objects of devotion as much as carriers of words. These works were part of a larger artistic world where church building, wall painting, and decorating sacred spaces remained important expressions of faith and royal support. Even as the realm fractured, the capital and its monasteries preserved the memory of a courtly Orthodox civilization. The anti-heretical council held before 1371, attended by Ivan Alexander and his sons, also fits this picture: it shows a dynasty aware that guarding doctrine was part of ruling. On the eve of the disaster of 1371, the Bulgarian church and literature stood as a last stronghold of continuity—intellectually confident, artistically rich, and spiritually sure, though increasingly isolated from the political breakup overtaking the empire.

The empire’s division after the mid-1350s didn’t create a new economy but revealed the different rhythms of an older one. The kingdom remained mainly agricultural, but the farming base now had to support three political centers with different interests and exposure to war: Tarnovo in the core, Vidin in the west, and Dobruja on the Black Sea coast. This division mattered because the main trade routes were also the main danger zones. The Danube and maritime frontiers were the most vulnerable. In 1365, the Hungarian occupation of Vidin disrupted river trade and the western frontier; in 1364, the Byzantine attack on the Black Sea coast briefly took Anchialos and threatened Mesembria by land and sea; and in 1366, the Savoyard expedition attacked the same coast, capturing fortress after fortress before failing at Varna. Economic life during these years was shaped by war, occupation, and ransom-like diplomacy, with trade, harvests, and transport repeatedly affected by politics and conflict.

Still, the countryside continued to feed towns and fortresses. The kingdom’s wealth rested on grain fields, vineyards, orchards, livestock, and the work of villages tied to big urban and monastic centers. Even when written records are scarce, the logic is clear: the garrisons of cities like Vidin, Mesembria, and other coastal strongholds could only be maintained if the surrounding land produced enough food, fodder, and draft animals. Towns were not separate from agriculture; they were part of it. Their markets depended on nearby produce, and their own gardens, workshops, and suburbs formed an economic belt around the walls. In a time of political division, the countryside became even more important because each regional ruler had to draw resources from the lands he controlled. The empire’s division didn’t weaken its agricultural base; it made it more local.

Towns remained the main centers of trade and crafts. Tarnovo was still the top city, but Vidin, despite occupation and political upheaval, remained an important Danube center. The Black Sea cities—Varna, Mesembria, Anchialos, and smaller fortified ports—functioned as trading hubs where commerce, customs, and military defense overlapped. Urban life depended on a dense craft sector: metalworking, textiles, leather, carpentry, building trades, and fortress repairs all served both war and daily needs. The same workers who made tools, vessels, and fabrics also supported the walls, gates, and storehouses. In this way, the divided empire’s economy was not a static rural world with a few isolated towns but a network of fortified marketplaces whose workshops and storerooms were constantly involved in defense. The repeated sieges of coastal towns show how closely urban prosperity and military strength were linked.

Trade continued along familiar routes—the Danube, interior roads, Balkan passes, and the Black Sea. What changed from 1355 to 1371 was the cost and insecurity of travel. The western frontier was especially sensitive: the Hungarian capture of Vidin in 1365 cut a traditional Danube route, while the Black Sea coast faced raids, blockades, and shifting loyalties among Byzantine, Bulgarian, and Savoyard powers between 1364 and 1367. The presence of mobile troops, hired mercenaries, and paid military ventures also tells an economic story. Warfare increasingly required money to pay soldiers, secure passage, or hold fortresses temporarily. Money mattered not only in markets but also in diplomacy and defense. The circulation of silver for large trade and smaller coins for daily use continued to support commerce, even though political division made the monetary system more regional and uneven.

Royal charters from this time show a world where the crown still tried to regulate economic life through privileges, exemptions, and protections. Charters didn’t just record land gifts; they defined the tax and legal status of the estates receiving them. They could free merchants or monastery dependents from customs and transit fees at roads, bridges, markets, and river crossings; forbid interference at gates and approaches to fortified towns; and protect people and property from illegal seizure, placing disputes under formal courts. These documents reveal the practical structure of late medieval Bulgaria’s economy. It was full of tolls, fees, and local taxes, but royal favor could create pockets of immunity. The need for such clauses shows how valuable access routes, market rights, and safe movement were. In a divided kingdom, privilege became a substitute for central unity.

Landholding in this period fits the same picture. Monastic, noble, and royal lands were not just fields but complexes of rights over peasants, mills, roads, water, and taxes. A land grant could mean exemption from certain taxes, protection from forced labor, and confirmation of a monastery’s control over villages and resources. These arrangements show a state still bureaucratically organized even while politically divided. Offices handling taxes, local government, and courts remained important because the crown still expected to collect revenue, control movement, and confirm property. The empire’s division after 1355 didn’t end this system; it made it more conditional, regional, and dependent on negotiated privileges. The economy before 1371 showed continuity in form but stress in conditions: the same agricultural base, the same urban and trade patterns, but with routes endangered, revenues fragmented, and the monarchy forced to protect the economy by granting exceptions.

Between 1355 and 1371, the empire’s foreign policy unfolded amid two major changes: Byzantium was losing its ability to control the Balkans, and the Ottomans were no longer just raiders but an expanding power. For Ivan Alexander, the traditional Byzantine connection didn’t disappear immediately. In late 1355, a new marriage alliance linked Tarnovo and Constantinople, replacing an older agreement and sending a Bulgarian princess to the imperial city. This diplomatic move briefly kept the familiar rhythm of dynastic exchange and influence, even as the wider political scene changed completely. John V Palaiologos was still struggling with the fallout of civil war, the sons of John VI Kantakouzenos, and the need to seek help from the West. His unusual turn to the pope in 1355–1357, sending envoys to Constantinople, and the failure of those talks to bring real military aid show how desperate Byzantine diplomacy had become. Meanwhile, the Balkans saw the collapse of Serbian unity after Stefan Dušan’s death in December 1355, removing one of the main forces shaping the region and leaving it more open to Ottoman advance.

The church relationship between Tarnovo and Constantinople, though quiet at first, was not free of tension. Around 1361 or 1362, Patriarch Kallistos of Constantinople responded to a report from Tarnovo with a strong rebuke. He accused the Bulgarian church of not commemorating the other patriarchs, of irregular baptism practices, and of failing to use the sacred chrism from the Great Church. This exchange is striking less for its practical effects than for what it reveals about confidence on both sides. Constantinople still claimed universal authority, but Tarnovo felt secure enough to ignore the letter. This was not just a quarrel over religious details. It showed ongoing rivalry between two patriarchates at a time when political order was falling apart, and that the Bulgarian church, even in a divided kingdom, acted as an independent player in diplomacy. In this way, the quarrel was another sign that the old Byzantine system of Balkan hierarchy no longer held.

The first direct military clash with Byzantium came in 1364, when John V launched a surprise campaign against the Bulgarian Black Sea coast. Anchialos fell, and Mesembria was besieged from land and sea. Ivan Alexander responded not only with his own troops but by hiring Turkish mercenaries in Thrace, a force familiar to the Byzantines. This shows the Bulgarian ruler, no longer able to count on a stable southeastern border, turning to the very Ottoman forces dominating the region. This choice was practical but ominous. It helped Mesembria resist but also showed how much the balance of power had shifted. The 1364 conflict was the last Bulgarian-Byzantine war, but it was already fought under Ottoman conditions, with Christian rulers forced to negotiate with or hire the new power rather than confront it equally.

Even more dangerous was the Hungarian intervention in 1365. The old royal title “rex Bulgariae,” long part of Hungarian political language, now became real action. King Ludwig the Great demanded Ivan Sracimir recognize him as overlord; refusal led to invasion. At the end of May, Hungarian forces crossed the Danube near Orșova, reached Vidin quickly, and on June 2 took the city. The occupation was thorough: a Hungarian administration was set up under Benedict Himfi, and Ivan Sracimir and his family were taken prisoner and confined in Humnik, where they were forced to adopt Catholicism. Taking Vidin was not just a border raid but an attempt to change the political and religious map of northwestern Bulgaria. It also showed how weak the empire’s western border was. Vidin, already semi-independent, could be treated by foreign kings as a conquered and converted province, and Tarnovo’s central government had little power to reverse this loss quickly.

The 1366 crisis turned the Vidin affair into international diplomacy. John V Palaiologos, returning from Buda after months of talks with Ludwig and the pope, tried to travel home through Bulgarian lands. Ivan Alexander refused him passage, and the emperor was held at Vidin. This was politically explosive, turning a sovereign’s transit into a hostage situation and inviting outside intervention. In response, Amadeus VI of Savoy, who had just taken Gallipoli in an anti-Ottoman campaign, redirected his crusading fleet against the Bulgarian Black Sea coast. The October 1366 campaign was devastating: Ahtopol, Sozopol, Skafida, Anchialos, and Mesembria fell quickly; Varna was besieged; and the supposed crusade became openly anti-Bulgarian. But the result wasn’t just punishment. Negotiations followed, and Dobrotitsa of Kaliakra emerged as a key broker, dealing with both the Savoyard leader and John V. By late December, the emperor was released; he passed through Kaliakra and Mesembria and returned to Constantinople in spring 1367. In the wider settlement, the Black Sea ports taken by the Savoyards returned to Byzantium, while Dobrotitsa strengthened his position on the coast. This episode showed how Bulgaria’s fragmentation invited outside powers not only as enemies but as arbiters, kidnappers, and brokers in shifting coastal diplomacy.

While these crises unfolded, the Ottoman advance tightened its strategic grip. Gallipoli gave the Ottomans a permanent foothold in Europe; by 1359–1361 they had taken Didymoteichon, and a few years later Adrianople. Their pressure up the Maritsa valley, with Philippopolis taken in 1363, made every Balkan negotiation more urgent and alliances more fragile. John V spent much of his reign trying to unite Venice, Genoa, Serbia, and the pope into an anti-Turkish coalition, but these efforts were piecemeal and often self-defeating. Bulgaria, caught up in internal divisions and the Vidin and Black Sea crises, failed to develop a coherent response. By 1369, as the coastal balance shifted again and the emperor reorganized Mesembria and its surroundings into an imperial domain, the political map had become one of competing local lords, embattled emperors, and advancing Ottoman commanders. When Ivan Alexander died in February 1371, Bulgaria’s foreign relations were no longer a single policy but a set of separate, increasingly desperate arrangements made under the pressure of a Balkan order already breaking apart.

Between 1355 and 1371, the Bulgarian empire broke into parts ruled from Tarnovo, Vidin, and Dobruja. Ivan Alexander tried to keep the empire together, but after his death in 1371, his sons ruled separate areas. This division made Bulgaria weaker and allowed neighbors like Hungary and Byzantium to take parts of its land. The Ottomans also grew stronger, capturing key cities and pushing into the Balkans.

Wars during this time were mostly about controlling cities, forts, and trade routes. Bulgaria fought Byzantium on the coast and Hungary in the northwest. The Ottomans advanced steadily, taking important towns and defeating armies at the Battle of Maritsa in 1371. Bulgaria’s military was often divided and relied on hired troops, but it could not stop the growing Ottoman power.

Despite political troubles, Bulgaria’s state institutions kept working. Local rulers and nobles held power in their regions, while the court in Tarnovo tried to keep its authority. The church remained strong and independent, even arguing with the church in Constantinople. Monasteries and scribes kept producing art and books, preserving culture amid the empire’s decline.

The economy stayed mostly farming-based, supporting towns and armies. Trade routes along the Danube and Black Sea were important but became dangerous due to wars and occupations. The king still granted privileges to protect merchants and monasteries, but the empire’s split made economic life harder.

Foreign relations were complicated. Bulgaria kept some ties with Byzantium but also faced attacks from Hungary and the Savoyards. The Ottomans’ rise changed everything, forcing Bulgaria and its neighbors into uneasy deals. By 1371, Bulgaria was divided and weakened, unable to stop the Ottoman advance that would soon change the region forever.