Columbia subject headings:
Byzantine Empire--History--To 527.
Christianity and politics--Rome--History.
Christianity--Rome--History.
Constantine I, Emperor of Rome, -337.
Emperors--Rome--Biography.
Rome--History--Constantine I, the Great, 306-337.
Rome--Kings and rulers--Religious aspects--History.
Harvard subject headings:
Christian saints--Rome.--Biography.
Constantine I, Emperor of Rome, -337
Emperors--Rome--Biography
Princeton subject headings:
Christian saints--Rome--Biography.
Constantine I, Emperor of Rome, -337.
Emperors--Rome--Biography.