Roman Empire; Byzantine Empire; Christianity; Emperors--Byzantine Empire; Diocletian, Emperor of Rome, 245-313; Eusebius, of Caesarea, Bishop of Caesarea, ca. 260- ca. 340; Heresy; Persecution; Arius; Arians; Arianism; Athanasius, Saint, Patriarch...
Churches; Coptic Church; Jerusalem; Constantine I, Emperor of Rome, d. 337; Justinian I, Emperor of the East, 483?-565; Roman Catholic Church; Greek Orthodox Church; Oriental Orthodox churches; Syrian Orthodox Church; Mary, Blessed Virgin, Saint;...