Category:Theophylactus (793-849)
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English: Theophylact, also called Theophylaktos (Greek: Θεοφύλακτος; c. 793 – 15 January 849), was the eldest son of the Byzantine emperor Michael I Rangabe (r. 811–813) and grandson, on his mother's side, of Nikephoros I (r. 802–811). He was junior co-emperor alongside his father for the duration of the latter's reign, and was tonsured, castrated, and exiled to Plate Island after his overthrow, under the monastic name Eustratius.