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Byzantine emperor Michael I Rangabe (depicted), under threat by conspiracies, abdicated in favor of his general Leo the Armenian, and became a monk.

Historical image related to Byzantine emperor Michael I Rangabe (depicted), under threat by conspiracies, abdicated in favor of his general Leo the Armenian, and became a monk. from July 11, 813

Related Wikipedia articles

Michael I Rangabe

Byzantine emperor from 811 to 813

Michael I Rangabe was Byzantine emperor from 811 to 813. A courtier of Emperor Nikephoros I, he survived the disastrous campaign against the Bulgars and was preferred as imperial successor over Staurakios, who was severely injured. He was proclaimed emperor by Patriarch…
Source: Wikipedia (CC BY-SA)

Leo V the Armenian

Byzantine emperor (813 to 820)

Leo V the Armenian was the Byzantine emperor from 813 to 820. He is chiefly remembered for ending the decade-long war with the Bulgars, as well as initiating the second period of Byzantine iconoclasm.
Source: Wikipedia (CC BY-SA)