Of noble origin. He managed to expel from Alexandria the heretics Novatians, who were proud of their virtue, walked around dressed in white, and refused to pray for those who committed mortal sin… The Jews in Alexandria were brutally killing Christians, poisoning them. Saint Cyril managed to get Emperor Theodosius the Younger to expel the Jews from Alexandria. He resolved the fight against the Patriarch of Constantinople, Nestorius, at the Third Ecumenical Council, which he presided over. After the Council condemned and anathematized him, Nestorius was exiled by the emperor to the eastern border of the empire, where he died when a worm ate away his tongue, with which he had blasphemed the Most Holy Theotokos, calling her the Mother of Christ. Saint Cyril died peacefully in 444.

Saint Cyril of Belozersky.