(c. 378–444 AD)
Patriarch of Alexandria. He was the son of the sister of the patriarch Theophilus and was born in Theodosiu c. 378 and educated at the monastery of Deir Anba Macarius in the Nitrian Valley. He became a priest in Alexandria and succeeded his uncle as patriarch in 412. Cyril was a vigorous opponent of Neoplatonism and Nestorianism and took a leading part in the Council of Ephesus in 431, when the teachings of Nestorius were condemned as heresy. He died in Alexandria on 27 June 444 and was succeeded by Dioscorus.
Historical Dictionary Of Ancient Egypt by Morris L. Bierbrier
Ancient Egypt. A Reference Guide. EdwART. 2011.