Columbia subject headings:
Church history--Primitive and early church, ca. 30-600--Congresses.
Rome--Civilization--Congresses.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600--Congresses.
Rome--Civilization--Congresses.
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600--Congresses.
Rome--Civilization--Congresses.