Columbia subject headings:
Byzantine Empire--Civilization--527-1081.
Byzantine Empire--Civilization--To 527.
Rome--Civilization.
Harvard subject headings:
Byzantine Empire--Civilization--527-1081.
Byzantine Empire--Civilization--To 527.
Rome--Civilization
Princeton subject headings:
Byzantine Empire--Civilization--527-1081.
Byzantine Empire--Civilization--To 527.
Rome--Civilization.