Columbia subject headings:
Islamic Empire--History.
Islamic countries--History.
Harvard subject headings:
Caliphs--History.
India--Kings and rulers--History.
Islamic Empire--Kings and rulers.
Islamic countries--Kings and rulers--History.
Muslims--History.
Sultans--History.
Princeton subject headings:
Caliphs--History.
India--Kings and rulers--History.
Islamic Empire--Kings and rulers.
Islamic countries--Kings and rulers--History.
Muslims--History.
Sultans--History.