Byzantine-Bulgarian treaty of 815
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Was a 30-year peace agreement signed in Constantinople between the Bulgarian Khan Omurtag and the Byzantine Emperor Leo V the Armenian.
Chronology
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January 816: The possibility of an anti-Bulgarian alliance between the Byzantine and the Frankish empires, the need to consolidate Bulgarian authority in the newly conquered lands, and the new stirring of the tribes in the steppes gave reason for Omurtag to conclude a 30-year peace treaty with the Byzantines in 815. Under this agreement, the Great Balkans became another time the natural border between the two empires, and Byzantium regained the cities it had lost in the Black Sea.
January 816: Krum's successor Khan Omurtag (r. 814-831) concluded a 30-year peace treaty with the Byzantines, thus allowing both countries to restore their economies and finance after the bloody conflicts in the first decade of the century, establishing the border along the Erkesia trench between Debeltos on the Black Sea and the valley of the Maritsa River at Kalugerovo.
