Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History, Military--Congresses.
War--Religious aspects--Christianity--Congresses.
Princeton subject headings:
Byzantine Empire--History, Military--Congresses.
Ideology--Byzantine Empire--History--Congresses.
Military art and science--Byzantine Empire--History--Congresses.
Politics and war--Byzantine Empire--History--Congresses.
Propaganda--Byzantine Empire--Congresses.
War--Religious aspects--Congresses.