Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Civilization--1081-1453--Congresses.
Byzantine Empire--History--1081-1453--Congresses.
Greece--Civilization--1453-1821--Congresses.
Greece--History--1453-1821--Congresses.
Princeton subject headings:
Greece--Civilization--Congresses.
Greece--History--Congresses.
Greece--Relations--Italy--Venice--Congresses.
Venice (Italy)--Relations--Greece--Congresses.