Columbia subject headings:
Harvard subject headings:
Africa, North--History--647-1517.
Africa, North--History--To 647.
Arabs--Africa, North--History--To 1500.
Arabs--Libya--History--To 1500.
Byzantine Empire--History, Military--527-1081.
Byzantine Empire--History--527-1081.
Byzantine Empire--Relations--Islamic Empire.
Islamic Empire--Relations--Byzantine Empire.
Libya--History--642-1551
Libya--History--To 642.
Princeton subject headings:
Africa, North--History--647-1517.
Africa, North--History--To 647.
Arabs--Africa, North--History--To 1500.
Arabs--Libya--History--To 1500.
Byzantine Empire--History, Military--527-1081.
Byzantine Empire--History--527-1081.
Byzantine Empire--Relations--Islamic Empire.
Islamic Empire--Relations--Byzantine Empire.
Libya--History--642-1551.
Libya--History--To 642.