Columbia subject headings:
Arabs--History--To 622.
Byzantine Empire--History--To 527.
Middle East--History--To 622.
Harvard subject headings:
Arabs--History--To 622
Byzantine Empire--History--To 527.
Middle East--History--To 622.
Princeton subject headings:
Arabs--History--To 622.
Byzantine Empire--History--To 527.
Middle East--History--To 622.