Columbia subject headings:
Harvard subject headings:
Imperialism--Congresses
Peace-building--Rome--Congresses.
Rome--Boundaries--Congresses.
Rome--History--Empire, 30 B.C.-284 A.D.--Congresses.
Rome--Politics and government--30 B.C.-284 A.D.--Congresses.
Princeton subject headings:
Imperialism--History--Congresses.
Peace-building--Rome--Congresses.
Rome--Boundaries--Congresses.
Rome--Politics and government--30 B.C.-284 A.D.--Congresses.