Optional Memorial of St. Cyril of Alexandria, 378-444; began his career as archbishop of Alexandria with impulsive--often violent--actions; but he championed the cause of orthodoxy against the heresy of Nestorius, who taught that in Christ there were two persons, one human and one divine; at the Council of Ephesus in 431, Cyril condemned Nestorianism and proclaimed Mary truly the “God-bearer”—the mother of the one Person who is truly God and truly human