Easter; Holidays; Tradition; Liturgies; Churches; Calendar; Polycarp, Saint, Bishop of Smyrna; Rome (Italy); Alexandria (Egypt); Society and Church; Council of Nicaea (1st: 325); Cyril, of Alexandria, Saint, ca. 370-444
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;