Byzantine–Bulgarian war of 913–927

Byzantine–Bulgarian war of 913–927
Part of the Byzantine–Bulgarian wars Bulgarian–Serbian wars
Date 913–927 Location Balkan Peninsula Result Decisive Bulgarian victory Byzantium recognizes the imperial title of the Bulgarian monarchs and the Bulgarian Patriarchate Serbia annexed by Bulgaria
Belligerents
Bulgarian Empire	Byzantine Empire Principality of Serbia
Commanders and leaders
Simeon I the Great Peter I George Sursuvul Theodore Sigritsa Marmais	Constantine VII Romanos I Lekapenos Zoe Karbonopsina Nicholas Mystikos Leo Phokas the Elder Petar Gojniković Pavle Branović Zaharija Pribisavljević
Strength
Unknown	Unknown
Casualties and losses
Unknown	Heavy

Decisive Bulgarian victory

The Byzantine–Bulgarian war of 913–927 (Bulgarian: Българо–византийска война от 913–927) was fought between the Bulgarian Empire and the Byzantine Empire for more than a decade. Although the war was provoked by the Byzantine emperor Alexander's decision to discontinue paying an annual tribute to Bulgaria, the military and ideological initiative was held by Simeon I of Bulgaria, who demanded to be recognized as Tsar and made it clear that he aimed to conquer not only Constantinople but the rest of the Byzantine Empire, as well.

In 917, the Bulgarian army dealt a crushing defeat to the Byzantines at the Battle of Achelous, resulting in Bulgaria's total military supremacy in the Balkans. The Bulgarians again defeated the Byzantines at Katasyrtai in 917, Pegae in 921 and Constantinople in 922. The Bulgarians also captured the important city of Adrianople in Thrace and seized the capital of the Theme of Hellas, Thebes, deep in southern Greece. Following the disaster at Achelous, Byzantine diplomacy incited the Principality of Serbia to attack Bulgaria from the west, but this assault was easily contained. In 924, the Serbs ambushed and defeated a small Bulgarian army on its way to Serbia, provoking a major retaliatory campaign that ended with Bulgaria's annexation of Serbia at the end of that year.

...
Wikipedia