The archbishop of Ephesus, Greece, and a learned theologian who authored many treatises that influenced his contemporaries. He erected monasteries in Jerusalem and Constantinople. The monastery in Constantinople was involved in a dispute with the Byzantine Emperor, Theophilus. The monks in the abbey were called Abrahamites, after the founding saint, and they refused to accept the heresy of the Iconoclasts of the time. Died: 6th century Feastday: October 28.