Uprising of Ivaylo

The second half of the 13th century is a period of serious trials for the Bulgarian peasantry. During this time, the condition of the Bulgarian peasants deteriorates sharply due to several interconnected factors. The intensified exploitation by the ruling class, which imposes heavy taxes and arbitrary measures, contributes to the growing discontent among the peasants. Moreover, the constant invasions by the Byzantines, Magyars, and Tatars create additional chaos and destruction, while the central authority in Bulgaria fails to effectively deal with these external threats. This inability of the state to protect the population and ensure order and security deepens the crisis and fuels popular dissatisfaction.

As a result of these harsh conditions, in 1277 an uprising breaks out in northeastern Bulgaria, which quickly gains strength and becomes a significant event in Bulgarian history. At the head of this uprising stands the ordinary shepherd Ivaylo, who is distinguished by a keen mind, resourcefulness, and courage. It is assumed that he possesses some military training, likely acquired in a local feudal militia or during wartime, serving in the ranks of a feudal levy. This training enables him to organize and lead the insurgents effectively, which is rare for a man of common origin in those times.

Around Ivaylo gather many peasants who are ready to fight against the ruling class and change their harsh conditions. The insurgents begin with attacks on boyar estates, from which they procure weapons and provisions. These actions not only strengthen their military power but also symbolize the struggle against feudal exploitation. The uprising rapidly expands, with more and more people joining Ivaylo's cause.

The contemporary Byzantine author George Pachymeres, who witnesses the events, describes how Ivaylo daily gains more supporters and displays exceptional bravery in his attacks. These words emphasize the dynamism and growing popularity of the uprising. Another Byzantine historian, Nikephoros Gregoras, notes that around Ivaylo gather many simple and unruly people, indicating that the movement is mass-based and includes broad layers of the population. He also points out that Ivaylo quickly accumulates great wealth and gathers a sufficient army, which is evidence of the successful organization and effectiveness of the uprising.

The rebellious peasants win a series of victories over the boyars, even managing to drive two Tatar detachments beyond the Danube River. These military successes significantly increase Ivaylo's fame and contribute to the growth in the number of his supporters. In the autumn of 1277, the Tarnovo tsar Constantine Asen marches with an army against the insurgents but is defeated by Ivaylo. During the battle, part of the tsar's soldiers switch to the insurgents' side, further weakening the royal army. Tsar Constantine Asen falls killed in this battle, and the event makes a strong impression on the popular masses and is preserved in a folk song recorded in the Provadiya region [in northeastern Bulgaria]. This song is a vivid testimony to the significance of the uprising and to Ivaylo's heroism in the eyes of the common people.

In the early stages of the uprising led by Ivaylo, also known as Ivanco, he boldly boasts aloud that he will conquer royal land, demonstrating confidence and ambition to change the status quo in Bulgaria. This daring act does not go unnoticed, especially by Tsar Constantine, known in the sources as Constantine Asen, who at that time holds power in the Bulgarian lands and is directly affected by the rising rebellion.

The Byzantine Empire, under the rule of Emperor Michael VIII Palaiologos, watches with concern the rapid development of the uprising. According to the chronicler Nikephoros Gregoras, who describes the events of this period in detail, Michael VIII experiences serious worry and despair regarding the actions of Lakhana, as Ivaylo is known in the Roman (Byzantine) sources. The emperor does not perceive the uprising merely as a temporary threat but foresees that Lakhana will amass significant power and become a serious adversary, difficult for the Roman troops to defeat.

In response to this danger, Michael VIII undertakes strategic moves aimed at weakening and eliminating the uprising. He decides to incite the Tatars, who are a powerful and unpredictable ally, to attack the insurgents, thereby hoping to disrupt their organization and weaken them. Additionally, the emperor sends his own Roman troops against Ivaylo to increase military pressure and restore control over the Bulgarian territories.

At the same time, Michael VIII has a political plan for Bulgaria. He wants to place a compliant person on the Tarnovo throne who will serve Byzantine interests and ensure stability in the region. His choice falls on the son of the Bulgarian boyar Mitso, who is described as weak-willed and susceptible to foreign influence, making him an ideal candidate for a puppet ruler.

To strengthen his authority and legitimize his choice, the emperor marries Mitso's son to his own daughter, creating dynastic ties between Byzantium and the new Bulgarian tsar. After this marriage, Michael VIII proclaims Mitso's son as Tsar of Bulgaria, hoping to establish control and suppress Ivaylo's uprising through political and military means. These actions reflect the complex and dynamic situation in the region, where Ivaylo's rebellion provokes not only internal changes but also serious international reactions.

In the spring of 1278, military operations began against the insurgent forces led by Ivaylo. These combat actions were organized and carried out by the allied troops of the Tatars and the Byzantines, whose aim was to suppress the uprising and restore control over the Bulgarian lands.

Nevertheless, the historical sources describing these events contain significant discrepancies and contradictions among different authors, which complicates a complete and accurate reproduction of what transpired.

Manuel Philes is the author of a poem that describes events from the time of Ivaylo's uprising, but the historical reliability of this source is the subject of serious disputes among scholars. Some authors do not accept it at all as a reliable historical document, and P. Mutafchiev expresses the opinion that the historical value of the poem is quite insignificant. He evaluates it primarily as a source for the historical geography of the Bulgarian lands, which means that the poem may be useful for localizing certain places, but not for the accurate reconstruction of events and military actions.

Similar to Mutafchiev, Hr. Lopartov shares skepticism regarding Manuel Philes' poem, also considering it an unreliable source. Nevertheless, V. Zlatarski presents well-founded arguments against Lopartov, attempting to defend the poem as a historical source. However, it should be noted that Zlatarski's exposition does not fully take into account the specifics of strategy and tactics from Manuel Philes' era, nor does it consider the fortification features of that time. This calls into question the full applicability of his arguments.

Moreover, at the time of Zlatarski, most of the fortresses mentioned in the poem had not been localized, which complicates the verification of Manuel Philes' claims and further reduces the possibility of an accurate historical interpretation. Manuel Philes himself, as a poet, does not observe the chronology of events in his work, nor does he have a good knowledge of the places where the described events took place. He is guided by the requirements of versification and poetic devices, which means that the artistic means and rhythm of the poem take precedence over historical accuracy.

Similar poetic devices are observed in other Byzantine poets such as Gregory of Pisidia and John Geometer, which shows that Manuel Philes is part of a tradition of Byzantine poetry in which exaggerations and glorification of heroes are common. In his poem, Manuel Philes strives to glorify the Byzantine commander Michael Glabas, often using hyperbole in his descriptions. For example, he claims that the Roman (Byzantine) troops led by Michael Glabas captured more than 30 fortresses, which is obviously an exaggeration.

To hold these fortresses, the Romans had to place garrisons of 100 to 300 men in each. This means that for 30 fortresses, between 3,000 and 9,000 soldiers would have to be allocated solely for garrison duty. This figure is unrealistic, considering that the usual size of the Byzantine army sent to Bulgaria did not exceed 10,000 men. Using 3,000–9,000 men just for garrisons in fortresses is unthinkable given the army's size at the time, which once again emphasizes that Manuel Philes' poem must be approached with a great deal of critical scrutiny and cannot serve as an accurate historical source for the military actions and conquests during Ivaylo's uprising.

In medieval battles, the losses of troops were usually relatively low, around 2–3% of the total army size. However, these percentages do not include those who died from diseases, which always accompanied military campaigns during this period. Diseases were often a greater enemy to the army than the opponent itself, significantly weakening the combat capability of the troops. In prolonged military actions, such as 30 battles with an army of about 10,000 men, combat losses would have exceeded 6,000 soldiers. Such a huge number of casualties would have completely bled the army dry and made it incapable of continuing effective combat operations.

During Ivaylo's uprising, the treacherous boyars played a key role by surrendering some fortresses to the Byzantines without a fight. This betrayal significantly facilitated the advance of the Byzantine forces and changed the dynamics of the conflict. Because of these betrayals, the expressions used by the chronicler Manuel Philes such as "captured" and "seized" should be taken conditionally, as they often do not refer to military victory but rather to the handing over of fortresses without resistance.

To trace the military actions and better understand the course of the Byzantine invasion, it is necessary to clarify the location of some of the fortresses mentioned in Manuel Philes’ poem. Nevertheless, some of these fortresses remain unlocalized, which complicates historical research. Among them is the fortress Sten (Stenos), whose exact location is the subject of various hypotheses.

The renowned Bulgarian historian V. Zlatarski suggests that the fortress Sten was located in the valley of the river Golyama Kamchiya. Meanwhile, K. Shkorpil believes that it is the fortress Istenlikale, situated above the right bank of the river Ticha, which is a tributary of the Golyama Kamchiya. This fortress lies west of the Lopushenska River, which is also a tributary of the Golyama Kamchiya. Despite these theories, it is more likely that the fortress Sten is identical with the fortress Stanata, located in the Novopazarsko region.

Etymological analysis supports this hypothesis, as the name of the fortress Stanata is related to the Greek word στενός, meaning "narrow pass". The fortress Stanata is strategically positioned, guarding the narrow pass between the Provadiysko Plateau and the Stana ridge. It rises on the ridge north of the present-day village of Stan and covers an area of about 40 decares, making it a significant military structure for its time.

Furthermore, the fortress Stanata is situated on an important road connecting Varna with Petrich (near Razdelna station) and Ovech (modern Provadia). According to Manuel Philes, these towns were captured by the Byzantines, indicating the advance of the Byzantine invasion in the region. From the fortress Sten (Stanata), the road continues towards Veliki Preslav and Tarnovgrad, which were the ultimate objectives of the Byzantine forces.

It was probably along this road that the troops of Michael Glabas Tarchaniotes initially advanced after penetrating into Moesia. This suggests that control over the fortress Sten was of key importance to the Byzantines, as it served as a strategic point for their further advance towards the heart of the Bulgarian state. Combined with the betrayals of the boyars and the heavy losses of the Bulgarian army, these factors contributed to the serious weakening of Ivaylo's uprising and to the progress of the Byzantine invasion.

During the course of Ivaylo's uprising, the Byzantine forces launched an offensive that was, however, halted before the fortress of Byalgrad. This fortress played a key role in the defense of Bulgarian territories and represented a significant obstacle for the Byzantine troops. The Byzantines used several military routes, among which was the road Veliki Preslav—Patsimisk—Ovchaga, passing near the village of Asparuhovo. This route was strategically important as it connected vital fortresses and controlled access to the interior of Bulgaria.

Among the fortresses mentioned in the sources is Istenlikale, which according to Manuel Philes is identified with the fortress Styaniks. It is located on another military route, probably used by the Byzantine forces, indicating that the empire relied on several directions for its military operations. Nevertheless, the exact location of Styaniks remains unclear, but its mention testifies to the complex network of fortifications that were part of the region's defensive system.

Another important site is the fortress Ustie, which has not been precisely localized. The researcher V. Zlatarski expressed the opinion that Ustie is not a fortress but a locality situated at the mouth of the Ticha River near Veliki Preslav. This hypothesis is supported by the fact that in the Gerlovskiy Gorge, where the locality Ustie is found, lie the ruins of the fortress Dolnite Nastrazhini. This provides grounds to assume that the locality Ustie in the Gerlovskiy Gorge is indeed the fortress Ustie mentioned in Manuel Philes' poem. V. Avramov, on the other hand, believes that the fortress Ustie was located near Provadia, showing that there are differing interpretations regarding its location.

Patsimisk is another fortress that remains unlocalized but is mentioned in the sources as part of the Byzantine military route. K. Jireček suggested that Patsimisk was situated in the valley of the Kamchiya River, while K. Shkorpil identified it with the fortress Pchelin Kale near the village of Smyadovo. Shkorpil presented convincing arguments supporting this identification, noting that the localization of Patsimisk in this area is quite plausible from the perspective of military operations. Furthermore, Patsimisk is also mentioned by the Arab geographer Idrisi, which further confirms its significance and existence.

In addition to these fortresses, the sources mention Vyaditsa (Yanitsa) and Tundzha, which also have not been precisely localized. A. Shpirkov believes that Vyaditsa corresponds to the present-day town of Nova Zagora, and that the fortress Tundzha was located in the area of the village of Rechitsa in the Sliven region. This hypothesis is supported by the research of T. Gerasimov, who provides grounds to assume that the ancient city Tonzos was situated in the area of the village of Rechitsa. Tonzos is mentioned by Ptolemy, and coins from the time of this city have been found in the vicinity of Rechitsa, confirming the reports of the ancient geographer. Moreover, the distance of Tonzos from Kabile, given by Ptolemy, matches the location of the village of Rechitsa. Kabile is located near the village of Kabile in the Yambol region, which further supports this identification.

Local tradition, recorded by P. Deligradev, states that in the area of the village of Rechitsa there once existed the city of Tundzha. This tradition coincides with archaeological data and historical sources indicating that the medieval city of Tundzha was located on the site of today's village of Rechitsa. This information is important for understanding the geographical and strategic situation during Ivaylo's uprising, as the fortresses and towns in this area played a key role in the defense and control of the territories.

Thus, the analysis of the military route Veliki Preslav—Patsimisk—Ovchaga and the associated fortresses such as Styaniks (Istenlikale), Ustie, Patsimisk, Vyaditsa, and Tundzha reveals the complex network of fortifications and strategic points that were essential for the military actions during Ivaylo's uprising. These fortresses not only served for defense but also determined the paths of troop movements and the possibilities for offensive or retreat, which directly influenced the course and outcome of the conflict.

The fortress of Pyrgita occupied a key position in the area of the village of Gorno Aleksandrovo, blocking the southern exit of the Kotel Pass. This position gave it exceptional strategic importance, as control over the pass was essential for the movement of troops and supplies in the region. Pyrgita served as a natural barrier against the advancing Byzantine forces attempting to penetrate Bulgarian lands through this important route.

Another important fortified point was Ryakhovo, located near the village of Oryahovitsa in the Stara Zagora region. It is important to note that Ryakhovo is not situated in northeastern Bulgaria, which highlights the spread of Bulgarian fortifications and their role in defending various regions. This fortress was part of a broader network of defensive structures that ensured control and security in the southern parts of the country.

The fortress of Venets, located near the village of Asenovets in the Nova Zagora region, was also part of this system. Its location further strengthened the defense of the passes and communication lines in the area, hindering enemy advances and providing the Bulgarian forces with the opportunity for rapid response.

Vicha, situated on Cape St. Athanasius, represented yet another important point in the defensive network. It is important to clarify that Vicha is not located at the mouth of the Kamchiya River, which clarifies the geographical features of the fortress and its role in the context of military operations. This position allowed control over both maritime and land routes in the area.

The fortress of Devina, also known as Diavena or Vida, rose in the area of Vida Hill, about 4 kilometers south of Kotel. It should be noted that Devina is not the present-day town of Devnya and is not located at the Iron Gates Pass, which is important for the correct localization of the battles and understanding the strategic positions of the Bulgarian troops. This fortress was key for controlling the surrounding terrain and providing protection against enemy attacks.

The fortress of Krun was located 2.5 kilometers north of the village of Krun in the Kazanlak region, while Kachovo was situated in the area of the village of Katuntsitse in the Kotel Pass. These two fortresses complemented the defensive system by ensuring control over important roads and passes, which was essential for the maneuvers of both Bulgarian and Byzantine forces.

The military actions during Ivaylo's uprising can be analyzed by outlining the probable battle routes of the Byzantine troops. These routes are based on the fortresses mentioned by Emperor Manuel I Komnenos, as well as on the accounts of the Byzantine chroniclers George Pachymeres and Nikephoros Gregoras. This approach allows for the reconstruction of the dynamics of the military operations and the understanding of the strategic decisions of both sides.

In determining the military actions, the strategic objectives of the Byzantine command during the different phases of the fighting are taken into account, which are clearly indicated in the sources. These objectives included the capture of key passes and fortresses to secure control over the territory and suppress Ivaylo's uprising.

The analysis of the military actions would not be complete without considering the fortification systems in the Bulgarian lands and the communications between them. These systems represented a complex network of fortresses and roads that allowed for the rapid transfer of troops and supplies, as well as coordination of the defense. This network was crucial for the resilience of the Bulgarian resistance and for the successful conduct of military operations against the Byzantine forces.

In the spring of 1278, the Byzantine Empire launched a large-scale military offensive against the Bulgarian lands, placing one of the most experienced and respected commanders of the time, Michael Glabas Tarchaniotes, at the head of the strong army. He was known for his skillful command and strategic thinking, which made him a key figure in Byzantium's attempts to regain control over the Bulgarian territories affected by Ivaylo's uprising.

Michael Glabas set out towards the Bulgarian lands with the clear objective of establishing a Byzantine presence and delivering a crushing blow to the Bulgarian forces. Historical sources often mention that a landing was carried out in the area of the fortress Kalata, also known as Galata. However, a precise analysis of the geographical features of the coast in this area shows that it is high and rocky, which practically excludes the possibility of a sea landing. This detail is significant as it reveals that the Byzantine army entered the Bulgarian lands by land, not through naval operations.

The Byzantine chronicler Manuel Philes describes Michael Glabas's actions with the phrase that he "embraced the entire Zigos," referring to the Balkan range (Stara Planina). In translations, this phrase is often inaccurately interpreted as "conquered," but this is false, since the mountain range is about 530 kilometers long and cannot be conquered like a city or fortress. A more accurate interpretation is that Michael Glabas advanced along the coastal road, which passes through important Byzantine fortresses such as Anchialos (modern Pomorie) and Mesembria (modern Nesebar).

Anchialos and Mesembria are strategically important fortresses that the Byzantines had captured as early as 1263 under the leadership of Michael Glabas himself. These fortresses served as a convenient base for the Byzantine army's offensive in 1278, providing stable logistical support and control over the coastline.

The Byzantine troops advanced north along the coastal road, successively capturing a number of key fortresses and territories. Among them were the fortresses Emona, located at Cape Emine, Vicha at Cape St. Athanasius, and Koziak, modern Obzor. Additionally, the Byzantines managed to seize the Karia valley, situated along the Kamchia River, which gave them control over important agricultural and transportation areas.

The fortress Kalata (Galata) was taken by land, confirming the absence of a sea landing and emphasizing Michael Glabas's successful land campaign. After capturing Kalata, the Byzantines continued their advance and succeeded in taking Varna, one of the most significant cities on the Bulgarian Black Sea coast. These successes allowed Michael Glabas to establish a substantial bridgehead with a secured rear from the sea, which was extremely important for maintaining and strengthening the Byzantine positions.

At this point, Ivaylo, the leader of the Bulgarian uprising, did not have a fleet capable of countering Byzantine naval power. The Byzantine fleet was strong and likely played a key role in delivering reinforcements and supplies to the land army, which further strengthened Michael Glabas's positions and complicated Bulgarian resistance. This coordination between the Byzantine land and naval forces was an important factor in the success of the campaign in the spring of 1278.

After Michael Glabas took command of the Byzantine forces, he headed towards the capital of the Second Bulgarian Empire – Tarnovgrad, with the aim of expanding Byzantine influence and suppressing Ivaylo's uprising. On his way to Tarnovgrad, Michael Glabas undertook a series of conquests of key fortresses that controlled important roads and strategic passes in the region.

The first fortress captured by the Byzantine commander was Petrich, located near the Razdelna station. This fortress was important because it lay on the medieval road connecting Varna with the interior of Bulgaria. After that, Michael Glabas seized the fortress of Provat, present-day Provadia, which was also situated on this key route. Provat was a crucial point for controlling the road from Varna to Shumen, Veliki Preslav, and Tarnovgrad.

The next fortress to fall under Byzantine control was Sten, also known as Stenos or Stanata, located near Novi Pazar. This fortress had particular strategic significance as it blocked the gorge of the Provadiyska River between the Madara Heights and the Stana Heights. Control over Sten gave the Byzantines the ability to monitor and block movement along the important road from Varna to the interior of Bulgaria.

Despite Michael Glabas’s successes in capturing these fortresses, the Byzantine troops also managed to take Veliki Preslav – one of the most significant cities in the Bulgarian state. However, this success was not sufficient for a full advance towards Tarnovgrad, as the Byzantines encountered serious resistance at the fortress of Byalgrad.

The fortress Byalgrad, defended by the voivode Damian, is located in the area called Kamaka, which is a flat summit on the northern slopes of the Preslav Mountain, near the village of Varbitsa. The village lies about 6 kilometers west of Veliki Preslav. The local population calls the fortress "Byaloto gradishte" (the White Fortress), which speaks to its deeply rooted significance in the region.

Byalgrad holds an exceptionally important strategic position, as it blocks the Dervish Pass – a key road leading to the Gerlovska Basin. From there, through the Varbishki Pass, one reaches Thrace, making the fortress critical for controlling the road from Veliki Preslav to Tarnovgrad. For this reason, Michael Glabas was forced to halt his advance and lay siege to Byalgrad to secure a safe route to the capital.

The fortress wall of Byalgrad has an irregular trapezoidal shape, approximately 250 meters long and 50 meters wide. It was built from rubble stone bonded with white mortar, which likely gave the fortress its name. Although today only minor remains of the wall survive, it is assumed that towers stood at the western and northern corners, serving for observation and defense. The main gate was probably located on the southern side, in the saddle area connecting the Kamaka summit with Kushlya Peak – the most accessible approach to the fortress from the south.

Byalgrad’s water supply was provided through an aqueduct, whose catchment was located on the southwestern slopes of Kushlya Peak. This was an important element of the fortress’s defensive system, as it ensured water for the defenders during the siege.

The researcher G. Dzhinov suggests that the fortress Byalgrad existed already during the First Bulgarian Empire, highlighting its long-standing strategic importance in Bulgarian history. This historical continuity likely contributed to the determination of voivode Damian and the local population to defend the fortress against the Byzantine offensive.

The siege of Byalgrad by Michael Glabas represents a key moment in the Byzantine campaign against Ivaylo’s uprising. Success or failure at this fortress would determine the possibility of further movement towards Tarnovgrad and, consequently, the fate of the Bulgarian state during this critical period.

The siege of the fortress Byalgrad dragged on, which forced Ivaylo to seek new political and military solutions to strengthen his position. At this critical moment, he accepted the proposal of the widow of Constantine Asen, Maria, to marry her. This marriage was not merely a personal act but a strategic move aimed at taking the Tarnovo throne and stabilizing the internal situation in the country. The reason for the marriage was explicitly stated as a desire "for peace and to prevent bloodshed in internecine wars," reflecting Ivaylo’s and Maria’s wish to avoid bloody conflicts and unite their forces against external threats.

The country at this time was seriously threatened by the invasion of foreign invaders, while the Roman (Byzantine) troops advanced towards Tarnovgrad with the clear goal of imposing their candidate on the throne, appointed by the Byzantine emperor. In this context, Maria’s goal was to preserve her throne and prevent Byzantine influence through an alliance with Ivaylo. This alliance was of key importance for repelling external enemies and preserving Bulgarian statehood.

After the marriage was concluded, Ivaylo entered Tarnovgrad at the head of his troops, managing to do so without shedding blood, which speaks to his skillful politics and ability to gain support. He was then crowned tsar, which officially confirmed him as the ruler of Bulgaria. Nevertheless, his stay in Tarnovgrad was short-lived, as soon after he set out to fight the Tatars, who represented another serious threat to the country.

The troops of Michael Glabas, one of the Byzantine commanders, were attacked by the rebel voivodes Kuman, Kancho, Momchil, and Damyan. These rebel leaders were described by the Byzantine chronicler Manuel Philes as "hostile, hateful rebels, thieves, and destroyers of the state." He notes that they appeared suddenly and "bristled for battle like a fierce dragon from the depths of the earth," emphasizing their unexpected and fierce activity. These events took place during the summer heat, when conditions for military actions were especially harsh.

Probably by this time Ivaylo had already dealt with the Tatars, led by Kasim Beg, which allowed him to turn against the Byzantine troops. The Byzantine chronicler Pachymeres writes that "the engagements he fought were successful," noting that the opponents were unable to withstand Ivaylo’s unexpected attacks. He adds that the strong Byzantine army feared meeting him, which testifies to the high military talent and tactical inventiveness of the Bulgarian ruler.

These military successes and political moves of Ivaylo after the siege of Byalgrad demonstrate his determination and skill in combining diplomacy with military force to defend his country from external and internal enemies. The alliance with Maria and the subsequent battles against the Tatars and Byzantines are key moments in his uprising and in his attempt to preserve Bulgarian independence during a difficult period.

The troops of Michael Glabas began to suffer a series of defeats, as attested by the chroniclers Manuel Philes and Pachymeres. These losses were not accidental but the result of the strategic situation in which the Bulgarian forces found themselves. The position of Michael Glabas was especially dire, as his rear was seriously threatened from the south, which further complicated the defense and maneuvering capabilities of his army.

Manuel Philes describes one of Michael Glabas’s key opponents—Stan, also called Stoyan—as a stronger and bolder dragon who mercilessly devastated the region of Zagora. This area lay south of the Eastern Balkan range and was an important strategic district, whose destruction seriously weakened the positions of the Roman (Byzantine) troops. According to Manuel Philes, Stan’s actions were decisive in creating pressure on the rear units of Michael Glabas.

According to Nikephoros Gregoras, Ivaylo planned, with the arrival of spring, to undertake ambush attacks against neighboring Roman villages and small towns. This tactic aimed to weaken the Roman settlements, thereby allowing Ivaylo to strengthen his own position and increase his military power. This approach was part of his broader strategy to penetrate Thrace, a key region for control over the territory.

The poem of Manuel Philes confirms that Ivaylo indeed succeeded in carrying out his intention to penetrate into Thrace. This penetration was not only a tactical achievement but also a symbol of the growing strength and influence of the insurgents under his command.

At the same time, Michael Glabas continued to suffer defeats in Moesia, which further weakened his army. Threatened by rear attacks in Thrace, he was forced to retreat from key positions. Among these positions were the fortress of Bialgrad, from which his troops withdrew, as well as Veliki Preslav—a significant city that was also abandoned by Michael Glabas.

The retreat of Michael Glabas passed through several strategic points. He withdrew his troops through the fortress of Patsimiskos, also known as Pchelin Kale, located near the village of Smyadovo. After that, his army passed through Ovchaga, today’s Asparuhovo, and finally reached Aetos, the modern town of Aytos. This route of retreat shows Michael Glabas’s attempts to preserve the remnants of his army and regroup in safer areas.

Despite the retreat, Michael Glabas managed to bring with him considerable booty and numerous prisoners. He took captives and rich spoils from the fortress of Ustie, located near Veliki Preslav, as well as from Veliki Preslav itself. Additionally, prisoners and loot were taken from Styaisk, situated on the right bank of the Golyama Kamchiya River near the confluence of the Lopushevska River, as well as from Provat, today’s Provadiya.

The area around Provat and the valleys near the Golyama Kamchiya River had been depopulated so that no intact Roman-inhabited territory remained that could serve as a stronghold for the enemies. This depopulation was part of Michael Glabas’s strategy to deprive the opponent of resources and support in this region, thereby attempting to delay or prevent the further advance of Ivaylo and his forces.

After it became clear in Constantinople that the forces of Michael Glabas were failing to cope with the rebel troops of Ivaylo, Emperor Michael VIII Palaiologos decided to send a strong army to assist. This support was entrusted to the Byzantine appointee Ivan Asen III, who was tasked with strengthening the positions of the Roman (Byzantine) forces and suppressing the uprising. At that time, the region of Zagora was under the control of the rebel troops led by Stan (Stoyan), which posed a serious threat to Byzantine dominance in the area.

Ivaylo's army chose a bypass route passing through several key settlements and fortresses. This path went through Veroy (modern Stara Zagora), Kolina (the village of Kolena in the Stara Zagora region), Ryakhovo (the village of Oryahovitsa), Vushtshta — Yanitsa (modern Nova Zagora), and Venets (the fortress near the village of Asenovets, Novo Zagora region). This route was strategically important as it allowed the rebel forces to circumvent the stronger Roman positions and consolidate their control over Zagora.

A detachment of the rebel army was sent through the Zmeves Pass, which connects Veroy with the Sub-Balkan valley. This detachment succeeded in capturing several fortresses — Krag (near the village of Krun), Maglii (modern Maglizh), and Verdishta (modern Tvarditsa). Afterwards, the two detachments united at the fortress of Tundzha, located in the village of Rechitsa, Sliven region, and together continued their advance.

During this offensive, the rebel army also captured the fortresses of Komena (Kamena near Sliven) and Sotirpol (the village of Sotir, Sliven region). These successes demonstrated that Ivaylo's uprising continued to gain strength and expand its territorial control, necessitating a more active intervention by the Byzantines.

Meanwhile, the army of Michael VIII Palaiologos, led by Ivan Asen III, was approaching the forces of Michael Glabas. Michael Glabas's troops advanced from Aetos to the west and managed to capture the fortresses of Ktenia (near the village of Lozarevo, Karnobat region) and Lardea (near the village of Lozenets, Yambol region). These conquests allowed the Roman forces to continue along the Sub-Balkan route, strengthening their positions and creating conditions for a joint offensive against the rebels.

At this critical moment, the two Roman armies, commanded by Michael Glabas and Ivan Asen III, met the main rebel forces personally led by Ivaylo. He found himself caught between two lines of fire — simultaneously attacked from the east and west by the two Roman armies. This tactical encirclement placed Ivaylo in an extremely difficult situation, leading to a decisive battle at Pirgrista (modern village of Gorno Aleksandrovo, Sliven region).

In this battle, Ivaylo suffered defeat and was forced to retreat. According to the chronicler George Pachymeres, "Lachana (Ivaylo) was surrounded by the numerous troops of Asen (Ivan Asen III)," highlighting the dire position of the rebel leader. After the "terrible battle," Ivaylo withdrew to Moesia, likely using the Kotlenski Pass as his escape route.

In the area of the fortress Ichera, which at that time was strong and strategically important, the name of a locality called "Ivaylo's Holes" has been preserved. According to a local tradition recounted by residents of the region, it was there that Ivaylo sought refuge when pursued by the Roman troops. This legend testifies to the dramatic circumstances surrounding the rebel's retreat and his struggle for survival in the face of the powerful Byzantine offensive.

The fortress of Attica, known among the local population as Lakhma, played a key role in the events following the uprising of Ivaylo. This name likely represents a variation of the nickname Lakhana, which Byzantine authors gave to Ivaylo himself. This fact suggests that Ivaylo retreated precisely through the Kotlen Pass, which is of great importance for understanding the subsequent military actions and strategic movements of the Byzantine troops.

After their defeat, the Byzantine forces organized into two columns, which headed towards Moesia with the aim of restoring control over the region and consolidating Byzantine authority in the Bulgarian lands. These two columns passed through the Varbish Pass and the Kotlen Pass, allowing them to cover a wide front and capture numerous fortresses located at strategically important points.

The right column, according to the Byzantine chronicler Manuel Philes, succeeded in capturing a number of fortresses, among which were Mokren — Pachovo (today the village of Mokrena, renamed Avramov), the fortress of Studena, located near the village of Gârlo, northeast of Avramov, as well as the fortresses of Urvich and Varbitsa. In addition, this column also conquered Veliki Preslav, one of the most significant fortresses in the region, as well as Byalgrad, located about 6 kilometers west of Veliki Preslav. These conquests were of exceptional importance, as they allowed the Byzantines to establish control over important roads and fortifications in Moesia.

The left column also achieved significant successes, capturing the fortress of Gologled on Pogledets Peak, located north of the village of Vezenkovo. Furthermore, it took the fortresses of Ichera (village of Ichera), Gramena (village of Gradec), Kachovo (village of Katuntsishte), and Divavena — Devina — Vida, situated south of Kotel. An important part of the left column’s conquests was also the Kishilov Valley, where the Kishilov fortress and Kharsovgrad stood. This column also captured the fortress of Kozyak, located in the Kozyanitsa area, northeast of Kotel, as well as the fortress of Aticha — Ticha, situated in the Boaza area, south of the village of Ticha. Among the captured fortresses were also Petrovun — Petrovgrad, as well as Theophylact, also known as Kurvingrad, located on the watershed between the rivers Ticha and Luda Kamchiya. These conquests provided the Byzantines with control over important strategic points and roads, significantly complicating the possibilities for Bulgarian resistance in the region.

After the two columns penetrated Moesia and captured numerous fortresses, they united and together headed towards Tarnovgrad, the Bulgarian capital. According to some sources, the Byzantine troops entered Tarnovgrad after a prolonged siege, which testifies to the seriousness of the resistance offered by the Bulgarians. In the capital, the Byzantines placed Ivan Asen III on the throne, thus attempting to restore their control and legitimize their authority through the Bulgarian royal line.

An important moment in these events was the fate of Maria, the wife of Ivan Asen III, and their son, who were sent to Constantinople. This action had symbolic significance, as the Byzantines thus demonstrated their power and influence over the Bulgarian dynasty.

Manuel Philes reports that Michael Glabas, one of the leading Byzantine commanders, sent from Tarnovgrad “the lioness of the Bulgarians together with the very lion cub... to the crowned lion.” This metaphor emphasizes both the victory of the Byzantines and the subjugation of Bulgarian authority to the emperor in Constantinople, symbolized by the “crowned lion” — the imperial emblem. This act was not only a political gesture but also a message of the final establishment of Byzantine hegemony in the region after Ivaylo’s uprising.

The army commanded by Ivaylo possessed large forces, which allowed it to conduct active military operations against the Byzantine (Roman) conquerors. In response, the Byzantine forces undertook strategic moves, sending a detachment through Lovech towards Vidin, aiming to limit and cut off the advance of the insurgents. Michael Glabas, one of the main Byzantine commanders, headed towards Veliki Preslav, which at that time was occupied by the insurgents, likely led by Ivaylo. This fortress held important strategic significance, as it controlled the roads in northeastern Bulgaria.

Despite the initial occupation of Veliki Preslav by the insurgents, Michael Glabas managed to capture the fortress, demonstrating military effectiveness and the ability to restore control over key positions. After that, he pursued the retreating forces of Ivaylo towards Cherven, where he continued the chase. From there, Michael Glabas moved towards Pristria, present-day Silistra, where Ivaylo’s troops found a secure refuge. This move shows that the insurgents sought fortified positions to defend themselves against Byzantine attacks.

The siege of the fortress Pristria lasted three months, indicating the serious resistance offered by the defenders. Despite the efforts of the Byzantine troops, they were forced to withdraw, as they failed to capture the fortress. This failure proved to be a serious blow to the Byzantine campaign in Bulgaria. At the same time, Michael Glabas fell ill and therefore departed for Constantinople, which ended his role as the commander-in-chief of the Byzantine forces in Bulgaria. This fact meant that the Byzantine army lost its experienced leader at a critical moment.

In the spring of 1279, Ivaylo’s troops went on the offensive, managing to liberate a number of regions from the conquerors in a short time. This success shows that Ivaylo’s uprising remained strong and continued to threaten Byzantine positions. After the liberation of these territories, Ivaylo’s forces headed towards the capital Tarnovo, which was a direct threat to the center of power in Bulgaria.

The Byzantine Emperor Michael VIII Palaiologos became alarmed by Ivaylo’s advance and took decisive measures, sending a new army of 10,000 men against the insurgents. This army was led by the emperor’s son-in-law, Murin, which underscores the importance the Byzantine court attached to suppressing the uprising. Murin’s army camped at the foot of the fortress Devina, also known as Vida.

The fortress Devina rose on the height Vida, located about 4 kilometers southeast of Kotel. It played a key role in controlling the Vrathnik pass, situated between the peaks Vida and Pleshivitsa. The height Vida had a pyramidal shape and a rocky eastern slope, which made it naturally defended and difficult to capture. Although today only insignificant traces of the fortress Devina remain, historical records and archaeological data confirm its significance.

The fortress was supplied with water through an aqueduct, which was extremely important for its prolonged defense during sieges. Dr. Ivan Borovov, in his work "Description of Kotel" from 1864, provides a detailed description of this aqueduct, and traces of it can still be seen today. This technical feature demonstrates the level of engineering skill and strategic planning invested in the fortifications of Devina.

Thus, the army of Murin, positioned as described, and the fortified fortress Devina represented a serious obstacle to Ivaylo’s troops, who continued to fight for the liberation of Bulgarian lands. These events and military actions reflect the complex and dynamic situation in Bulgaria during the period of Ivaylo’s uprising, as well as Byzantium’s efforts to maintain its influence in the region.

On 17 July 1279, Ivaylo, the leader of the Bulgarian uprising, launched a decisive attack against the Byzantine army, which was positioned at the foot of the fortress of Devina, on its northern side. This area, known today as Greek Valley, proved to be crucial for the course of the battle. Ivaylo succeeded in completely routing the Byzantine forces, and according to the chronicler George Pachymeres, the victory was total and decisive. Local tradition, preserved by K. Shkorpil, also keeps the memory of this great victory of Ivaylo’s troops, emphasizing its significance for Bulgarian history.

The battle was fought between Bulgarians and Greeks, and according to tradition, the Byzantine casualties numbered around 16,000, including their emperor. This figure is close to the data provided by Pachymeres, which attests to the heavy losses suffered by the Roman (Byzantine) army. It is important to note that the death of the emperor should be understood as the death of the commander Murin, who likely led the Byzantine forces in the battle.

A key role in the Bulgarians’ success was played by the surrender of the fortress of Devina by the voivode (female commander) Vida. She handed over the fortress to Ivaylo’s troops, which significantly facilitated their victory. With Vida’s help, the Bulgarians managed to cut off the Byzantines’ retreat route through the Vrathnika defile, located at the foot of the fortress of Devina. This action placed the Byzantine army in encirclement in the Devina area, where conditions were especially favorable for a complete encirclement and destruction. According to Pachymeres, only under such encirclement could the Byzantine army be utterly defeated and subjected to a great slaughter.

Ivaylo and his troops arrived from the north, which allowed them to close all possible retreat routes of the enemy. The peak and fortress associated with the name of the voivode Vida still bear her name today, as a testament to her role in the events.

After the defeat of the Byzantine army at Devina, Emperor Michael VIII Palaiologos sent a new army against Ivaylo. This new Byzantine force numbered about 5,000 men and was commanded by the general Aprin. On 15 August 1279, a new battle took place between the Bulgarians and the Byzantines. Before this battle, Ivaylo performed numerous feats that boosted the morale and combat capability of his troops.

In the new battle, Ivaylo again achieved a complete victory over the Byzantine army. According to Pachymeres, after the defeat, the general Aprin fled, which can be interpreted as a flight or a desperate attempt to save himself. This success consolidated Ivaylo’s position and demonstrated his military skill and ability to cope with the enemy’s numerical superiority.

During Ivaylo's uprising, he managed to win another great victory, the exact location of which remains unclear to this day. Nevertheless, the traditions preserved among the inhabitants of Tvarditsa recount a strong enemy who succeeded in capturing the Tvarditsa fortress – a strategic fortress situated on the Gradishte height, located about 1.5 kilometers north of the town of Tvarditsa itself. This height stands at an altitude of 400 meters and represents a natural defensive position, as it is surrounded on three sides – north, west, and south – by the Tvardishka River.

The Tvardishka River forms almost vertical and inaccessible cliffs that descend to its riverbed, making access to the fortress possible only from the eastern side. This terrain feature turns the fortress into an almost impregnable stronghold, since the natural barriers limit the possibilities for attack and provide control over the Tvarditsa Pass, which the fortress blocks. The Tvarditsa Pass is an important route connecting Tarnovgrad with Tvarditsa, from where the road continues towards Boruy (modern Stara Zagora) and Sliven. Moreover, from the pass, a road leads eastward to Sredets, which underscores the strategic significance of the fortress as a control point for movement in the region.

The fortress wall follows the natural configuration of the terrain and encloses an area of about 24 to 25 decares. The remains of this wall rise above the ground up to 5.40 meters, attesting to its impressive height and defensive strength. The southern wall of the fortress is additionally reinforced with buttresses, and the thickness of the wall reaches 3 meters. It is built of rubble stone bonded with white mortar, which speaks to the quality and solid construction techniques used in its building.

After the fortress was captured by the enemy, its defenders sought refuge in the high-mountain fortress Shepsinigrad, which is also located in the area of the Tvarditsa Pass. However, even there they were driven out, demonstrating that the attackers had sufficient strength and determination to push the defenders out of all key positions in the region.

Historical sources provide only one specific record of the capture of the Tvarditsa fortress, which took place in 1278. This capture was carried out by Byzantine troops, and the period of the event should be related to the time of Tsar Constantine, probably Constantine Asen, who ruled from 1257 to 1277. This information places the event in the context of the complex political and military struggles in Bulgaria and Byzantium during the second half of the 13th century, when control over key fortresses like Tvarditsa was crucial for power in the region.

The second part of the tradition, related to Ivaylo's uprising, describes a severe defeat suffered by the enemy soldiers who wore helmets on their heads. Particular attention is drawn to the fact that one of these helmets was shiny and belonged to the commander, which suggests that the commander himself was among the destroyed. These two events in the tradition are closely connected and occurred one after the other, with the second part likely preserving the memory of the defeat of the army of the Byzantine general April in 1279.

General April advanced towards Tarnovgrad, the capital of the Second Bulgarian Empire, using the Tvarditsa Pass as the main route of advance. The Tvarditsa Pass is a strategically important path leading directly to the city, and therefore control over it was of decisive importance. During the battle, April's entire army was destroyed, with the tradition speaking of numerous slain enemy soldiers. This defeat was so complete that the Shkorpil brothers, renowned Bulgarian archaeologists and historians, discovered many bones in the lower part of the Tvarditsa Pass, which confirms the authenticity of the tradition and testifies to the scale of the battle.

Further investigations of the area established favorable opportunities for encircling the enemy at the beginning of the Tvarditsa Pass. It was precisely there that the Shkorpil brothers found the bones of slain soldiers, supporting the hypothesis that the decisive clash, which led to the total destruction of the Byzantine army, took place in this section. These archaeological finds are of exceptional importance for historical science, as they provide material evidence for the events described in the tradition.

Under Ivaylo's personal leadership, the Bulgarian troops won two great victories that saved the country from the looming Byzantine threat. These successes strengthened the position of the rebel leader and temporarily stabilized the situation in Bulgaria. At the same time, Ivan Asen III, who was a claimant to the Bulgarian throne and supported by the Byzantines, plundered the palace treasury and secretly fled Tarnovo, returning to Constantinople. His withdrawal created a power vacuum that the Tarnovo boyars hastened to fill by electing the prominent noble George Terter as tsar.

George Terter managed to unite Ivaylo's opponents in the country, which was key to subsequent events. Despite the heroic victories, Ivaylo no longer had sufficient forces to renew the struggle after the heavy and prolonged wars. He could not cope with the boyar resistance, which proved to be a serious obstacle to his rule and military actions.

In a desperate attempt to find support, Ivaylo decided to seek help from the Tatars and went to the camp of Khan Nogai. However, Byzantine diplomacy intervened with Khan Nogai, using its influence to thwart the plans of the Bulgarian leader. Through this Byzantine intervention, Ivaylo met his death, which put an end to his uprising and changed the course of Bulgarian history during this period.

The peasant uprising led by Ivaylo during the late Middle Ages, although ending in failure, leaves a deep mark on Bulgarian history. This uprising is not merely another revolt against authority, but an expression of the strong will of the Bulgarian peasantry to fight for a better and more just life. Under Ivaylo's leadership, the peasants manage to organize a determined resistance against the external invaders threatening the territory of Bulgaria. This resistance is crucial for saving the country from the devastating blows of the Tatars and the Byzantines, who at this time are among the main threats to Bulgarian statehood.

Ivaylo's uprising demonstrates not only the social aspirations of the Bulgarian people for justice but also their martial qualities. The peasants, united around the idea of liberation from internal and external oppressors, show their ability to organize and effectively oppose their enemies. This fact is especially significant, as in the medieval era such mass movements were often fragmented and disorganized. Ivaylo's uprising, however, proves the opposite—that the Bulgarian peasantry can be a strong and decisive factor in the political and military events of the country.

According to sources cited in historical literature, such as the works of Yordan Andreev, Nikephoros Gregoras, and others, the uprising also plays a positive role in strengthening the Bulgarian state. Although it fails to achieve a final victory, it helps stabilize the internal situation and prevent further invasions. In this sense, Ivaylo's uprising represents an important stage in the Bulgarian people's struggle to preserve their independence and identity during the difficult period of the 13th century.

Historians like Plamen Petrov and Vasil Zlatarski emphasize that the uprising reveals not only the social and military aspects of Bulgarian society but also its capacity to mobilize against internal oppressors—the local feudal lords and aristocrats who were often the cause of social inequality and injustice. This twofold struggle—against external invaders and internal oppressors—makes Ivaylo's uprising a unique phenomenon in medieval Bulgarian history.

In conclusion, Ivaylo's uprising, although it does not achieve ultimate success, plays a key role in preserving the Bulgarian state and in demonstrating the social and military qualities of the Bulgarian people. It remains a symbol of the aspiration for justice and freedom characteristic of the Bulgarian peasantry during the Middle Ages and continues to be the subject of in-depth research and analysis in historical scholarship.

Ivaylo's uprising, one of the most significant events in Bulgarian medieval history, has been thoroughly studied by numerous authors and sources that provide rich information about its course, geographical scope, and historical context. In volume 3 of "History of the Bulgarian State," Vasil Zlatarski devotes considerable attention to the events surrounding the uprising, discussing on pages 561 and 562 both the political prerequisites and the military actions that marked it. These studies are foundational for understanding the complex dynamics of the conflict and Ivaylo's role as the leader of the popular movement.

An important contribution to the topographical and geographical framework of the uprising comes from the research of K. Irsechek, who in his publication "The Christian Element in the Topographical Nomenclature of the Balkan Lands" (PSI, volumes 55–56, 1898, p. 256) analyzes the names of places and fortresses associated with the Bulgarian lands, including those that were the scene of military actions during the uprising. These toponyms are key to localizing the events and understanding the strategic moves of Ivaylo and his opponents.

The archaeological and historical research of K. Shkorpil, cited on pages 94–95, complements the picture with data on the fortifications and towns that played a role in the conflict. This information is also supported by publications in "GIBI" (volume 10, pp. 143–144), where specific fortresses and military installations that were subject to sieges or battles during the uprising are examined.

Alexander Pishirkov, in his article "The Names of Some of Our Towns" (INEM, volume 2, 1922, pp. 4–5), provides additional information about the towns that were important centers during the period of the uprising, analyzing their historical significance and connection to the military actions. These data are important for understanding the socio-economic environment in which the uprising developed.

Thracian geography has also been the subject of in-depth studies, with T. V. Gerasimov in "Contribution to the Ancient Geography of Thrace. The City of Tonzos" (IGTD, volume 3, 1935, p. 182) and P. Deliradev in "Contribution to the Historical Geography of Thrace" (volume 1, p. 258) providing valuable information about the territories that were the scene of military actions and strategic maneuvers. These studies help trace the movement of troops and understand the significance of certain fortresses and towns.

At. Popov, in his book "Fortresses and Fortifications in the Medieval Krăn Region" (Sofia, 1982, p. 100 and following), offers a detailed analysis of the fortifications that were key to the defense of territories during the uprising. This work contributes to the understanding of military architecture and tactics used by the Bulgarian forces under Ivaylo's leadership.

In the "Carmina" of Manuel Philes, cited in "GIBI" (volume 10, pp. 143–144 and 144), there are poetic descriptions and testimonies about the events of the time of the uprising, which complement the historical chronicles with emotional and cultural aspects. These sources are valuable for reconstructing the atmosphere and public sentiments during the conflict.

Georgius Pachymeres, in "De Michaele et Andronico Palaeologis" (p. 444, cited in "GIBI", volume 10, p. 178), provides a Byzantine perspective on the events, describing the reactions and actions of the Byzantine Empire regarding Ivaylo's uprising. This source is important for understanding the international context and diplomatic relations in the region.

The research of G. Dzhingov in the article "The Fortress of Bulgrad near Preslav" (IAI, volume 27, 1964, pp. 17–42) reveals the significance of the fortress of Bulgrad as a strategic point during the course of the uprising. This town was a key location for controlling the region and was the scene of important military actions.

Finally, the publication by St. Nedev in "Shumenska Zarya" (issue 112, 26 September 1972) complements the historical picture with analyses and commentaries that enrich the understanding of the events and their significance for Bulgarian history. This collection of sources and studies creates a comprehensive and multi-layered view of Ivaylo's uprising, its geographical boundaries, military actions, and historical importance.

The study of Ivaylo's uprising is based on numerous medieval and contemporary sources that provide rich and diverse information about the events of this period. Among the most significant chroniclers is George Pachymeres, author of De Michaele et Andronico Palaeologis, whose works are published in volume 10 of the Collection of Bulgarian Historical Sources (GIBI), where on pages 445 and 447 (corresponding to page 179 in the edition) important information about Bulgarian history and military actions during feudalism is contained. Pachymeres offers valuable Byzantine perspectives that contribute to a better understanding of the political and military situation in the region.

Another key source is Manuel Philes, author of the poetic collection Carmina, whose columns 203-204, 212, 220-222, 229-234, 250-251, and 255-270 (published in volume 10 of GIBI, pages 144-146) contain descriptions and commentaries that shed light on the events surrounding the uprising. These poems and texts not only document historical facts but also reflect the emotional and ideological context of the time, which is of particular importance for understanding the motivations and reactions of the participants.

Nikephoros Gregoras, author of Byzantina historia, presents the Byzantine view of the events, with his entries on pages 131-132 (in volume 11 of GIBI, pages 136-137) complementing the picture with details about the diplomatic and military actions related to the uprising. His work is valuable for its analytical approach and attention to the political nuances of the conflict.

In addition to the chronicles, there are specialized studies such as Bulgarian Military Art during Feudalism (page 560), which examine the tactical and strategic aspects of the military actions during the uprising. This source provides an in-depth analysis of military organization, armament, and combat methods used by the Bulgarian forces, which is key to understanding the successes and failures of Ivaylo and his opponents.

History of Bulgaria, volume 3, on pages 279-288 and 288, as well as the works of Vasil Zlatarski (History of the Bulgarian State, volume 3, page 570) and Ivan Duychev (From Old Bulgarian Literature, volume 2, Sofia, 1944, pages 65-66) complement the study with rich factual material and critical analysis of the events. These authors provide a contextual framework that links the military actions with the political and social processes in Bulgaria during the feudal period.

All the listed sources are carefully cited with exact pages and columns, which testifies to the detailed research and comparative analysis applied in the study of Ivaylo's uprising. Although this excerpt lacks specific facts about battles, commanders, armies, dates, or places, the presented bibliographic references are foundational for any thorough historical research on the topic and provide a reliable basis for further investigation and interpretation of the events.