Habbarid's, Abbasid Amirs of Sindh:'Abd Allah IV, ca. 1040s, AR damma, ND, ND, A-1502D, RR. The Abbasid Caliphate or Abbasid Empire was the third caliphate to succeed the Islamic prophet Muhammad. The Abbasid Revolution had its origins and first successes in the easterly region of Khorasan, far from the bases of Umayyad power in Syria and Iraq.