Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Civilization--1081-1453--Congresses.
Byzantine Empire--History--1081-1453--Congresses.
Turkey--Civilization--Congresses.
Turkey--History--Ottoman Empire, 1288-1918--Congresses.
Princeton subject headings:
Byzantine Empire--Civilization--Congresses.
Islamic civilization--Congresses.
Turkey--History--Ottoman Empire, 1288-1918--Congresses.