Columbia subject headings:
Christianity and politics--Rome--History.
Church and state--Rome.
Constantine I, Emperor of Rome, -337.
Emperors--Rome--Biography.
Rome--History--Constantine I, the Great, 306-337.
Harvard subject headings:
Church and state--Rome.
Constantine I, Emperor of Rome, -337
Emperors--Rome--Biography
Princeton subject headings:
Church and state--Rome.
Constantine I, Emperor of Rome, -337.
Emperors--Rome--Biography.