Columbia subject headings:
Harvard subject headings:
Church and state--Rome.
Church history--Primitive and early church, ca. 30-600
Rome--Politics and government--284-476
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600.
Constantine I, Emperor of Rome, -337.
Religion and state--Rome--History.
Rome--History--Constantine I, the Great, 306-337.