Columbia subject headings:
Harvard subject headings:
East and West--History--To 1500--Congresses.
Eastern churches--History--To 1500--Congresses.
Literature and history--Mediterranean Region--History--To1500--Congresses.
Middle Ages--Historiography--Congresses.
Religions--Relations--History--To 1500--Congresses.
Princeton subject headings:
East and West--History--To 1500--Congresses.
Eastern churches--History--To 1500--Congresses.
Literature and history--Mediterranean Region--History--To1500--Congresses.
Middle Ages--Historiography--Congresses.
Religions--Relations--History--To 1500--Congresses.