Byzantine co-emperor
b. c. 793 · d. 15 Jan 849
Theophylact or Theophylaktos was the eldest son of the Byzantine emperor Michael I Rangabe and grandson, on his mother's side, of Nikephoros I. 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.
Constantinople · Yassıada