Columbia subject headings:
Byzantine Empire--Kings and rulers.
Byzantine Empire--Politics and government.
Byzantine Empire--Religion.
Church and state--Byzantine Empire--History.
Harvard subject headings:
Byzantine Empire--Church history.
Byzantine Empire--Kings and rulers.
Byzantine Empire--Politics and government
Caesaropapism.
Church and state--Byzantine Empire.
Emperors--Byzantine Empire
Princeton subject headings:
Byzantine Empire--Church history.
Caesaropapism--History.
Church and state--Byzantine Empire--History.
Emperors--Byzantine Empire.