Title: Muḥammad al-Mahdī (158-169 H), Mūsá al-Hādī, (169-170 H)
Subjects: Caliphs, Biography, Abbasids, Kings and rulers, History
Places: Islamic Empire
People: Muḥammad ibn al-Ḥasan Mahdī (869-), Hādī Caliph (-786)
Time periods: 750-1258