Columbia subject headings:
Abbasids.
Islamic Empire--Boundaries--Byzantine Empire.
Islamic Empire--History--750-1258.
Jihad.
Harvard subject headings:
Abbasids.
Islamic Empire--Boundaries--Byzantine Empire.
Islamic Empire--History--750-1258.
Jihad
Princeton subject headings:
Abbasids.
Islamic Empire--Boundaries--Byzantine Empire.
Islamic Empire--History--750-1258.
Jihad.