St. Cyril of Alexandria

Birth of St. Cyril of Alexandria in Egypt - future Doctor of the Church and defender of Mary as Theotokos

St. Cyril becomes Patriarch of Alexandria - begins defense of Mary as Mother of God against Nestorius

Council of Ephesus - St. Cyril presides, defines Mary as Theotokos (Mother of God), condemns Nestorianism

Death of St. Cyril of Alexandria - left extensive writings on the Incarnation and Trinity