Theodoros of Edessa was a 9th-century bishop, monk, and theologian who lived in the Byzantine Empire. Born into a wealthy family in Edessa, he became an orphan at age ten and chose to distribute his inheritance to the poor before traveling to Jerusalem. After entering the monastery of Saint Sabbas, he eventually served as the bishop of Edessa. He is remembered for his theological writings and his efforts to defend orthodox doctrine against various heresies during his episcopate.