Columbia subject headings:
Harvard subject headings:
Abbasids--Biography.
Caliphs--Biography.
Hārūn al-Rashīd, Caliph, approximately 763-809.
Islamic Empire--History--750-1258.
Princeton subject headings:
Caliphs--Islamic Empire--Biography.
Hārūn al-Rashīd, Caliph, approximately 763-809.
Islamic Empire--History--750-1258.