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
Roman Empire; Diocletian, Emperor of Rome, 245-313; Administration; Government; Egypt; Libya; Council of Constantinople (1st: 381); Council of Chalcedon (451); Justinian I, Emperor of the East, 483?-565; Monothelitism; Constantinople