Columbia subject headings:
Harvard subject headings:
Futuwwa (Islamic social groups)--Islamic Empire.
Iran--History--640-1256.
Iran--History--To 640.
Islamic Empire--History, Military.
Social classes--Iran--History--To 1500.
ʻAyyārs.
Princeton subject headings:
Iran--History--640-1256.
Iran--History--To 640.
Military art and science--Iran--History.