Arabia, History Of, Yemen

To quell a rising in Yemen, the 'Abbasid caliph al-Ma'mun dispatched Ibn Ziyad, who refounded in 820 the southern city of Zabid and became overlord of Yemen, Najran, and Hadhramaut. About a century later, the Najahids—Ethiopian slaves or local Afro-Asians—supplanted the Ziyadids in Zabid; however, though independent, neither dynasty renounced vague 'Abbasid suzerainty. The Banu Ya'fur