Columbia subject headings:
Art, Byzantine.
Byzantine Empire--Civilization--527-1081.
Holy Roman Empire--History--Saxon House, 919-1024.
Harvard subject headings:
Art, Ottonian.
Byzantine Empire--Relations--Netherlands.
Holy Roman Empire--History--Saxon House, 919-1024.
Netherlands--Relations--Byzantine Empire.
Princeton subject headings:
Art, Byzantine.
Byzantine Empire--Civilization--527-1081.
Holy Roman Empire--History--Saxon House, 919-1024.