Columbia subject headings:
Harvard subject headings:
Abbasids.
Byzantine Empire--History.
Carolingians.
Holy Roman Empire--History.
Islamic Empire--History--661-750.
Islamic Empire--History--750-1258.
Religion and politics--Europe--History--To 1500.
Religion and politics--Middle East--History--To 1500.
Rome--History--Empire, 30 B.C.-476 A.D.
Umayyad dynasty.
Princeton subject headings:
Abbasids.
Byzantine Empire--History.
Carolingians.
Holy Roman Empire--History.
Islamic Empire--History--661-750.
Islamic Empire--History--750-1258.
Religion and politics--Europe.
Religion and politics--Middle East.
Rome--History--Empire, 284-476.
Umayyad dynasty.