Columbia subject headings:
Christian antiquities--Congresses.
Constantine I, Emperor of Rome, -337--Congresses.
Harvard subject headings:
Christian antiquities--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Constantine I, Emperor of Rome, -337--Congresses.
Rome--History--Constantine I, the Great, 306-337.
Rome--History--Constantines, 306-363.
Princeton subject headings:
Christian antiquities--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Constantine I, Emperor of Rome, -337--Congresses.
Rome--History--Constantine I, the Great, 306-337.
Rome--History--Constantines, 306-363.