Columbia subject headings:
Church history--Primitive and early church, ca. 30-600.
Constantine I, Emperor of Rome, -337.
Rome--History--Constantine I, the Great, 306-337.
Harvard subject headings:
Christianity and other religions--Paganism--History--Early church, ca. 30-600.
Church history--4th century.
Constantine I, Emperor of Rome, -337
Rome--History--Constantine I, the Great, 306-337.
Sun worship--History.
Princeton subject headings: