Columbia subject headings:
Byzantine Empire--Church history.
Byzantine Empire--History--527-1081.
Orthodox Eastern Church--Byzantine Empire--History.
Harvard subject headings:
Byzantine Empire--Church history.
Byzantine Empire--History--527-1081.
Orthodox Eastern Church--Byzantine Empire--History.
Princeton subject headings:
Byzantine Empire--Church history.
Byzantine Empire--History--527-1081.
Orthodox Eastern Church--Byzantine Empire--History.