Theodosius III

Theodosius III (died c. 754) was a tax collector at Adramyttium when the Byzantine navy and Opsician troops mutinied against Anastasius II in 715 and proclaimed the reluctant official emperor. His forces took Constantinople late that year, and he restored the Sixth Ecumenical Council's image.

The Anatolic and Armeniac themes rejected him as an Opsician puppet. He bought Bulgar aid from Khan Tervel to face Leo the Isaurian's revolt and an Umayyad invasion. After Leo captured his son at Nicomedia, Theodosius abdicated on 25 March 717 and spent his remaining years as a monk.