Columbia subject headings:
Cities and towns--Rome--Congresses.
Rome--Antiquities--Congresses.
Rome--History--Empire, 30 B.C.-476 A.D.--Congresses.
Harvard subject headings:
Cities and towns--Rome--Congresses.
Rome--Antiquities--Congresses.
Rome--History--Empire, 284-476--Congresses.
Rome--History--Empire, 30 B.C.-284 A.D.--Congresses.
Rome--History--Period of military anarchy, 235-284--Congresses.
Princeton subject headings:
Cities and towns--Europe--History--To 1500--Congresses.
Cities and towns--Rome--Congresses.
Europe--Antiquities, Roman--Congresses.
Rome--Antiquities--Congresses.
Rome--History--Diocletian, 284-305--Congresses.
Rome--History--Period of military anarchy, 235-284--Congresses.