Of noble origin. He succeeded in expelling from Alexandria the heretics Novatians, who were proud of their virtue, walked dressed in white, did not want to pray for those who committed a mortal sin... Jews in Alexandria brutally killed Christians, poisoned them. St. Cyril managed to get Emperor Theodosius the Younger to expel the Jews from Alexandria. He resolved the fight against Patriarch Nestorius of Constantinople at the III 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 his tongue with which he blasphemed the Blessed Virgin, calling her the Mother of Christ. Saint Cyril passed away peacefully in 444.

Saint Cyril of Bjelozerski.