Cities and towns; Christian converts; Byzantine Empire; Greek language; Coptic language; Copts; Persecution; Politics; Roman Empire; Arab Conquest of Egypt; Arabic language; Monasteries; Coptic Church; Muslim converts from Christianity;
Theology; Sacraments; Eucharist; Coptic Church; Protestantism; Christology; Clement, of Alexandria, Saint, ca. 150-ca. 215; John Chrysostom, Saint, d. 407; Cyril, of Alexandria, Saint, ca. 370-444; Athanasius, Saint, Patriarch of Alexandria, d. 373.