Columbia subject headings:
Byzantine Empire--Civilization--Congresses.
Byzantine Empire--Influence--Congresses.
Byzantine Empire--Intellectual life--Congresses.
Byzantine Empire--Relations--Congresses.
Harvard subject headings:
Byzantine Empire--Church history--Congresses.
Byzantine Empire--Civilization--Congresses.
Byzantine Empire--Relations--Europe--Congresses.
Byzantine Empire--Religion--Congresses.
Nicholas, of Cusa, Cardinal, 1401-1464
Philosophy--Byzantine Empire--Congresses.
Princeton subject headings:
Byzantine Empire--Civilization--Congresses.
Byzantine Empire--Relations--Congresses.
Knowledge, Sociology of--History--Congresses.