The Treaty of 815 was a 30-year peace agreement signed in Constantinople between the Bulgarian Khan Omurtag and the Byzantine Emperor Leo V the Armenian.
Territory of the First Bulgarian Empire in the early 9th century.
Leo V the Armenian.
The Bulgarian ruler Omurtag sends delegation to the Byzantine emperor.
Khan Omurtag.
Thomas the Slav
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Thomas the Slav was a 9th-century Byzantine military commander, most notable for leading a wide-scale revolt in 821–823 against Emperor Michael II the Amorian.
Byzantine–Bulgarian treaty of 815
…additionally agreed to provide help to each other in case of danger. True to his word, in 823 Omurtag relieved the siege of Constantinople by the rebel Thomas the Slav and defeated his army. Zlatarski, Vasil (1971) [1927]. "Part I. The Huno-Bulgarian dominance (679-852). II. Territorial expansion and rising of political…
Miniature from the Madrid Skylitzes version of the chronicle of John Skylitzes depicting Thomas, on horseback and dressed as a Byzantine emperor, negotiating with the Arabs. The rebellion of Thomas is one of the most richly illustrated episodes in the chronicle.
Miniature from the Madrid Skylitzes depicting Thomas's supposed flight to the Arabs
Gold solidus of Michael II with his son, Theophilos
Thomas's troops defeat the forces loyal to Michael II. Miniature from the Madrid Skylitzes.