Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History, Military--527-1081.
Byzantine Empire--History--527-1081.
Byzantine Empire--Politics and government--527-1081.
Byzantine Empire--Social policy.
Church history--Middle Ages, 600-1500
Princeton subject headings:
Byzantine Empire--History, Military--527-1081.
Byzantine Empire--History--527-1081.
Byzantine Empire--Politics and government--527-1081.
Byzantine Empire--Social policy.
Church history--Middle Ages, 600-1500.