Columbia subject headings:
Byzantine Empire--Church history--Sources.
Byzantine Empire--Church history.
Church and state--Byzantine Empire--History--Sources.
Church and state--Byzantine Empire--History.
Orthodox Eastern Church--Byzantine Empire--History--Sources.
Orthodox Eastern Church--Byzantine Empire--History.
Harvard subject headings:
Byzantine Empire--Church history.
Church history--Middle Ages, 600-1500
Orthodox Eastern Church--Byzantine Empire--History.
Princeton subject headings:
Byzantine Empire--Church history--Sources.
Byzantine Empire--Church history.
Church and state--Byzantine Empire--History--Sources.
Church and state--Byzantine Empire--History.
Orthodox Eastern Church--Byzantine Empire--History--Sources.
Orthodox Eastern Church--Byzantine Empire--History.