Columbia subject headings:
Harvard subject headings:
Civilization, Medieval--Congresses
Imperialism in literature--Congresses.
Imperialism--History--To 1500--Congresses.
Power (Social sciences) in literature--Congresses.
Power (Social sciences)--Mediterranean Region--History--To 1500--Congresses.
Princeton subject headings:
Imperialism--History--Congresses.
Power (Social sciences)--History--Congresses.