Battle of Beroe

Kaloyan, one of the most significant rulers of the Second Bulgarian Empire, became the victim of a treacherous conspiracy that ended with his assassination. This conspiracy was organized by the voivode Manastyr, who likely represented the discontent of a faction of the boyars towards the strong central authority imposed by Kaloyan. Among the conspirators is believed to have been his sister's son Boril, who, after Kaloyan's death, ascended the throne and thus became his successor.

According to the chronicler John Staurakios, Saint Demetrius was the cause of Kaloyan's death, with the account of the saint's miraculous intervention suggesting Greek involvement in the conspiracy. This interpretation implies that behind the assassination of the Bulgarian tsar there may have been external interference, which used religious symbols and myths to legitimize the events.

During his lifetime, Kaloyan left the Bulgarian state significantly strengthened and territorially expanded. He waged victorious wars with great energy, persistence, and military skill, managing to eliminate the Latin threat that loomed over Bulgaria during his reign. Extensive lands that had previously been under foreign rule were incorporated into the state’s borders, making him a worthy successor to the liberating work of the Asen dynasty.

After ascending the throne in 1207, Tsar Boril ruled until 1218. He undertook harsh persecutions against the supporters of the previous Asen dynasty, which led to the flight of the legitimate heirs to the throne—Asen and Alexander, sons of Tsar Asen I. They initially fled to the Cumans and later to the Principality of Galicia–Volhynia, seeking refuge and support.

As a result of internal conflicts and the weaknesses of the central authority, some boyars loyal to the previous dynasty broke away and declared themselves independent rulers. Among them was Kaloyan’s sister’s son, Slav, who proclaimed himself an independent ruler of the regions in Pirin and the Rhodopes. Initially, his capital was in Tsepin, near the village of Dorkovo, but later he moved it to Melnik.

Another relative of Kaloyan, Strez, also established an independent principality in Central Macedonia, with the center of his domain at Prosek, located above the Demir Kapija gorge. These separate domains further fragmented the unity of the Bulgarian state and weakened its internal stability.

The internal weakness of the state was immediately exploited by neighboring powers. The Hungarians seized the Belgrade and Braničevo regions, while the Serbs occupied Niš and parts of the northwestern Bulgarian lands. These losses demonstrate how vulnerable Bulgaria had become after Kaloyan’s death and the disintegration of central authority under Boril and the seceding boyars.

During the harsh winter of 1208, the Latin Emperor Henry, who had been ruling since 1208, launched a military campaign towards Thessalonica. This move was part of the Latin Empire's efforts to consolidate its control over the Balkan region following its conquests. His troops advanced through difficult winter conditions, which in itself speaks to the determination and ambitions of the emperor to expand his influence eastward.

The vanguard of the Latin forces reached the settlement of Mezhdespare, located between April and Rusion (modern-day Keşan). However, here they were surprised by an attack organized by about 300 Vlachs, who were in fact Bulgarians acting as a partisan detachment. These Vlachs managed to encircle the vanguard from all sides, giving them a tactical advantage. As a result of this ambush, some of the Latin soldiers were captured, while others were killed on the spot. This incident demonstrates that the Bulgarian forces used mobility and surprise strikes to weaken the enemy even before the main forces engaged in battle.

After the attack, the main Latin forces moved against the Bulgarians, but the Bulgarians quickly retreated, avoiding direct confrontation. The Latins pursued them until late in the evening but failed to catch them, which testifies to the good preparation and tactical flexibility of the Bulgarian and Cuman detachments. However, this pursuit exhausted the Latin troops and did not lead to a decisive success.

In the summer of the same year, the Bulgarian ruler Boril took command of united Bulgarian and Cuman forces. He launched an incursion into Eastern Thrace, devastating the area and demonstrating an aggressive strategy for expanding and defending Bulgarian territories. In response, Henry concentrated his entire army in the area of Salambriya (modern Selivria) and then moved it to Adrianople, a strategically important city that served as a base for further operations.

From Adrianople, the Latin troops began an advance towards Beroea, modern Stara Zagora. The Bulgarian forces used the night to approach the enemy positions stealthily, allowing them to deliver a surprise attack in the early hours of the day. During the attack, only the Latin black guard and the rear guard were armed and ready for battle, which gave the Bulgarians an advantage in the initial stage of the fight. A firefight began, during which the main Latin forces managed to form battle lines and engage in combat.

Despite the organized resistance, the Latins suffered significant losses in the battle of Beroea. Henry de Valenciennes, one of the chroniclers of the events, reports that the knightly army avoided total defeat thanks to the personal bravery of the knight Lienard and Emperor Henry himself. He claims that the emperor managed to repel the Bulgarian attack. Nevertheless, this account is biased and does not fully reflect the severity of the losses and the defeat suffered by the Latins.

After the battle, the Latin troops retreated to Plovdiv, where they found shelter behind the strong city walls. This withdrawal was a clear sign of failure and loss of initiative in the region. In the area of Stara Zagora and the nearby villages of Malka Vereya and Preslaven, there are localities known as "Latin cemeteries." These names testify to the significant losses the Latin army suffered in the area during the fighting.

Moreover, south of Stara Zagora, in the villages of Dimitrievo and Păstren, there are also localities called "Latin cemeteries." This indicates that the Latin army fought and suffered losses even as it approached Beroea, further highlighting the difficulties and resistance it encountered during the campaign. In conclusion, Emperor Henry's army fought fierce battles in the area of Dimitrievo and Păstren, which is part of the broader context of the battle of Beroea and the related military actions during 1208.

Henri de Valenciennes, a chronicler contemporary to the events, provides valuable information about the knights' retreat to Plovdiv following the defeat at Beroia. According to his descriptions, this retreat lasted twelve days, during which the troops covered a distance equivalent to five to six marches between the starting point and Plovdiv. This prolonged march was extremely arduous for the knights, as along the way they failed to find any wheat, barley, or wine — essential food supplies they needed to maintain their strength. The lack of provisions further complicated their situation and exhausted the army.

The retreat did not proceed without obstacles. The Bulgarian forces relentlessly pursued them, utilizing the terrain and the local population, which displayed hostile attitudes toward the Latin knights. The fighting was especially intense in the area of the villages Granit, Gorno Belevo, and Cherna Gora, where even today there are localities called “Latin cemeteries.” These names testify to the heavy losses the Latin troops suffered in this region, confirming that the Bulgarians pursued them and inflicted damage during the withdrawal. The battles in this zone delayed the knights’ movement and drained their strength, which had serious consequences for the further course of the campaign.

After reaching north of Plovdiv, the Latin troops encamped to recover and plan their next actions. From there, foragers were sent out, guarded by three knightly detachments, with the aim of securing provisions and strengthening the army’s positions. Nevertheless, the Bulgarians launched an attack against the foragers and their guards, which necessitated the intervention of the Latin emperor. He personally had to come to their aid to prevent the complete destruction of these units. Upon the arrival of the main knightly forces, the Bulgarians and Cumans quickly withdrew, avoiding direct confrontation with the stronger enemy.

Interestingly, the Latins did not pursue the retreating Bulgarians and Cumans but chose to return to their camp, likely to recover and prepare for the next battle. On the same day, not far from their camp, the main Bulgarian and Cuman forces were observed forming battle lines, ready for a new engagement. Despite their exhaustion from the long retreat and pursuit, the knights were forced to prepare for combat during the night, which speaks to the tension and seriousness of the situation.

The troops formed battle lines, with the order determined as to which detachments would advance first in the attack. For leading command roles in the forthcoming offensive, Pierre de Bracieux and Nicolas de Maïe were appointed, whose skills and experience were key to organizing the assault. Before the battle began, the chaplain Philip delivered an encouraging speech to the troops, aiming to raise the knights’ morale and prepare them for the trials ahead. This speech was an important moment for the army’s spirit, especially after the heavy losses and exhausting retreat they had endured.

The day after the deployment of the troops, the two armies faced each other in battle formation, ready for a decisive clash. Geoffrey of Villehardouin expressed a desire to be the first to launch an offensive against the Bulgarians, but Emperor Henry, remembering the heavy defeat of the knightly army at Adrianople in 1205, strictly forbade anyone to undertake an attack without his order. He also commanded the knightly detachments to guard each other to avoid breaches and chaos in the ranks.

On August 1, 1208, the two armies stood ready for battle. According to the chronicle of Villehardouin, Tsar Boril had organized his troops into 36 detachments, with their total number reaching 33,000 men. On the other hand, Emperor Henry had 15 detachments, each including 20 knights, while the imperial detachment was composed of 50 knights. This organization made Henry’s army almost equal in number to the Bulgarian one, although the Bulgarians had a significantly larger number of infantry and cavalry.

The clash between the two forces began with great ferocity. Every Latin soldier, with his lance lowered before him, spurred his horse on, recalling the Holy Sepulchre with great humility, which emphasized the religious zeal and determination of the knights. Both Bulgarians and Cumans participated in the battle, fighting fiercely, each striving to gather and destroy his opponent. The losses were heavy, and among the dead and wounded there were many, but the fallen could not be gathered and buried, since while some collected them, others killed them, which testifies to the mercilessness of the battle.

Despite the fierce resistance, the Latins managed to repel the Bulgarian-Cuman forces. Afterwards, they went on the offensive, but it was not as successful as Villehardouin describes. The reason for this was the heavy knightly armor, which limited the swift movements and gallops of the cavalry, making pursuit and maneuvers difficult in the uneven terrain.

It is likely that the Bulgarian troops retreated toward the St. Nicholas Pass in the vicinity of the village of Turiya, conducting rearguard battles during their withdrawal to delay the Latin advance and protect the retreat of the main forces. The area near the village of Zelenikovo, called the Latin Cemetery, lies on the road to the Turiya Pass and serves as evidence of these rearguard battles, as numerous remains from the fights have been found there.

However, the Latin troops did not dare to pursue the Bulgarians into the St. Nicholas Pass, as this pass held many dangers for them. The difficult terrain and the possibility of ambush made the pursuit risky, which caused the imperial forces to refrain from further advance in that direction. Thus, the battle ended with a tactical retreat of the Bulgarians, but without the complete destruction of their forces.

According to the chronicler George Akropolites, Alexius Slav ruled the strong and almost impregnable fortress of Melnik. He was an autocratic lord who did not submit to the surrounding rulers.

Nevertheless, sometimes Slav aided the Italians—the Latins of Constantinople—due to kinship ties, while on other occasions he supported the Bulgarians, driven by a sense of common ethnicity. This ambiguous policy of Alexius Slav reflects the complex political situation in the region following the defeat at Plovdiv and the Latin capture of Krichim.

In 1211, the Bulgarian ruler Boril faced serious challenges both internally and externally. The Vidin region, an important area in the northwestern part of the Bulgarian lands, was shaken by a rebellion that threatened the stability of Boril's rule. To deal with this uprising, Boril sought and received assistance from Hungarian troops, which demonstrated both the severity of the internal threat and his diplomatic efforts to strengthen his position through alliances with external powers. This support was crucial for suppressing the rebellion and maintaining control over the Vidin region.

At the same time, Boril was under pressure from external enemies, which forced him to improve relations with his cousin Strez, ruler of neighboring territories. This political and military coalition between the two was of strategic importance, as Boril sent military aid to Strez, thereby strengthening the alliance and preparing joint actions against their common enemy – the Latin Kingdom of Thessalonica. Strez had already conducted raids into Latin lands, indicating that the conflict with them was ongoing and that the two Bulgarian forces shared a common interest in striking the Latins.

Boril and Strez’s plan was to invade the territories of the Latin Kingdom of Thessalonica, thereby weakening the Latins’ influence and control in the region. However, the Latins did not remain passive and took the initiative by advancing towards the strategic city of Prosek. This advance led to a meeting of the two armies on the field near Bitola, where a decisive battle took place. Unfortunately for Boril, the Bulgarian forces were defeated in this battle, representing a serious military and political blow to him and his allies.

Despite the defeat, in the autumn of the same year Boril gathered a large army and marched towards the Latin Kingdom with the intention of restoring his positions and delivering a counterattack. On his way, he besieged the fortress of Melnik, an important strategic point and the residence of Alexius Slav. Alexius Slav was a ruler associated with this fortress, and its capture would have meant a significant strengthening of Bulgarian influence in the region. The siege of Melnik demonstrated Boril’s determination to continue military operations and consolidate his power despite previous setbacks.

These events of 1211 illustrate the complex political and military situation in which Boril found himself – caught between internal rebellions, alliances with related rulers, and conflicts with the Latin forces controlling important territories in Macedonia and Thrace. Despite the difficulties, Boril did not give up his attempts to strengthen and expand his domain, employing both diplomatic and military means.

The Melnik fortress, located on the plateau above the present-day town of Melnik, known as Slavova Fortress, was a strategic fortification with extremely difficult access. From the side of the town, the slopes of the plateau are steep, which hindered any attacks, while from the other sides they are almost vertical and inaccessible, providing natural protection against enemy raids. This geographical feature made the fortress nearly invincible during a siege, especially when considering the artificial fortifications that complemented it.

According to the researcher B. Tsvetkov, the Melnik fortress was built with three fortified belts that provided multilayered defense. The outer fortified belt covered an area of about 120,000 square meters and served to protect the outer town. Remains of the outer fortress wall have been found at the entrance to the outer town, confirming the presence of a well-organized defensive system. According to tradition, the southern gate of the citadel was located precisely here, which was a key point for controlling access to the fortress.

The Russian scholar V. Grigorovich, who visited Melnik in 1845, reported that at the entrance to the town from the southwest there are ruins of two towers that defended the gate of the medieval town. These towers were part of the second fortress wall, which followed the contours of the Slavova Fortress plateau. In the area known as Klyuch, remains of a fortress wall have been discovered, and it is assumed that there was a gate there leading to the road to the Mesta River valley through the Popsky Pass. This was an important strategic location, providing connection with the surrounding regions and control over trade and military routes.

At the highest part of the plateau, a citadel was built, which was protected by a third inner fortress wall. According to some researchers, this third fortress wall was double, which further complicated the attackers’ task. In front of it, there was a deep moat that served as an additional barrier against enemy forces. The thickness of the wall reached between 1.5 and 2 meters, and its height was 5 to 8 meters, making it extremely strong and difficult to overcome. Remains of fortress walls have also been found in the southern part of the plateau, indicating that the defense was comprehensive and covered all vulnerable points.

In the area of present-day Melnik, several water reservoirs have been found that supplied water to the fortress. At the end of the 19th century, V. Kanchov visited Melnik and noticed at the foot of the fortress, near the river, a tower whose remains of the substructure were visible until about ten years ago. This tower was likely intended to ensure the water supply of the fortress, which was vital during prolonged sieges and military actions.

In the context of the Battle of Beroia, Boril made significant efforts to capture the Melnik fortress, which was key to controlling the region. Despite this, the combined forces of the Latins and Despot Slav inflicted a heavy defeat on Boril’s troops, which changed the course of the conflict. After this defeat, a reversal occurred in the relations between Boril and Henry – the Latin ruler married the stepdaughter of the Bulgarian Tsar Boril, who was the daughter of Tsar Kaloyan. This marriage had political significance, as it symbolized reconciliation and alliance between the two sides after the military clashes, while simultaneously strengthening Boril’s position in the region.