Columbia subject headings:
Middle East--History--To 622--Congresses.
Syria--History--333 B.C.-634 A.D.--Congresses.
Harvard subject headings:
Middle East--History--To 622--Congresses.
Syria--History--333 B.C.-634 A.D.--Congresses.
Princeton subject headings:
Byzantine Empire--History--Congresses.
Syria--History--Congresses.