Byzantine–Bulgarian wars

The Byzantine–Bulgarian wars were a long series of conflicts between two major powers. One was the Byzantine Empire, a powerful state centered in Constantinople. The other was the Bulgarian Empire, which rose in the Balkan peninsula. These wars began after the Bulgars conquered parts of the Balkans after 680 AD. The fighting lasted for hundreds of years. It shaped the history of Southeastern Europe through many different leaders and eras.

The early conflicts often involved land and titles. In the late 600s, a Bulgar leader named Asparuh fought the Byzantine emperor Constantine IV. Asparuh won a battle at a place called Ongala. Because of this victory, the Byzantines had to recognize the Bulgarian state in 681 AD. They also had to pay protection money to prevent more attacks on Byzantine Thrace. Later, a Bulgar ruler named Tervel became a key player in Byzantine politics. In 705, Tervel provided an army of 15,000 horsemen to help Justinian II regain the Byzantine throne. As a reward, Justinian II gave Tervel the title of kaisar, or Caesar. This made Tervel the first foreign ruler to receive such a high title in Byzantine history.

Between 741 and 775, the wars shifted due to political instability in Bulgaria. The country faced a long period of crisis with many different rulers. During this time, the Byzantine Emperor Constantine V led nine separate campaigns against Bulgaria. He wanted to establish a Byzantine border on the Danube River. While Constantine V won some battles, the Bulgars also found success. In 759, a Bulgar Khan named Vinekh defeated the Byzantine army at the Rishki Pass. The wars were often difficult for the Byzantines because of the Balkan Mountains. In 765, a massive storm even sank 2,600 Byzantine ships.

The wars became even more intense under the leadership of Khan Krum. Krum was an aggressive ruler who led many successful raids. In 811, the Byzantine Emperor Nikephoros I launched a massive expedition into Bulgaria. He managed to capture the Bulgarian capital, Pliska, and set it on fire. However, the Byzantine army had to retreat through the mountains. Krum used the terrain to set traps and ambushes for the retreating soldiers. At the Vărbica pass, the Byzantines were caught against a moat and a wooden wall. The battle was a disaster for the Byzantines, and Emperor Nikephoros I was killed.

After Krum's era, Bulgaria experienced periods of great strength and sudden decline. Krum's son, Omurtag, negotiated a peace treaty that lasted for thirty years. Later, Simeon I ruled from 893 to 927 and led many successful military campaigns.

His son, Peter I, managed to negotiate another long-lasting peace. However, after Peter I, the Bulgarian state began to weaken. In 971, the Byzantine emperor John I Tzimiskes defeated Boris II and captured the Bulgarian capital, Preslav.

Although a leader named Samuel tried to stabilize the state, the Byzantines eventually gained control. Under Emperor Basil II, the Byzantines won the Battle of Kleidion and conquered Bulgaria in 1018.

Relations between the two empires fluctuated through the Middle Ages. In 1185, Theodore Peter and Ivan Asen started a revolt that succeeded. Later, during the Fourth Crusade in 1204, the Bulgarian emperor Kaloyan tried to make alliances. He eventually allied with the Nicaeans to reduce the power of the Crusaders. After the Latin Empire collapsed, the Byzantines and Bulgarians fought over lands like Thrace. The Bulgarian emperor Theodore Svetoslav was even able to retake some of these lost territories. These shifts showed how much the strength of one empire depended on the stability of the other.

The long history of these wars finally came to an end due to new powers. The Byzantine-Bulgarian relations continued to change until the Ottoman Turks arrived. The Turks captured the Bulgarian capital in 1393. They also captured the Byzantine capital of Constantinople in 1453. These two major events marked the end of the long struggle between the Byzantine and Bulgarian empires. The centuries of conflict had completely transformed the political landscape of the Balkan peninsula.