Columbia subject headings:
Rome--Civilization--Congresses.
Rome--History--Empire, 30 B.C.-284 A.D.--Congresses.
Harvard subject headings:
Rome--Civilization--Congresses.
Rome--History--Empire, 30 B.C.-284 A.D.--Congresses.
Princeton subject headings:
Rome--Civilization--Congresses.
Rome--History--Empire, 30 B.C.-284 A.D.--Congresses.