Columbia subject headings:
Byzantine Empire--History.
Rome--History--Empire, 284-476.
Harvard subject headings:
Byzantine Empire--History--Justinian I, 527-565.
Byzantine Empire--History--To 527.
Byzantine Empire--History.
Rome--History--Empire, 284-476.
Rome--History--Germanic Invasions, 3rd-6th centuries.
Princeton subject headings:
Byzantine Empire--History.
Rome--History--Empire, 284-476.
Rome--History.