Al-Mahdi Ahmad
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Ahmad was a son of al-Hasan bin al-Qasim (d. 1639), a brother of the former imam al-Mutawakkil Isma'il. In the reign of his uncle, in 1658, he led forces that loosely incorporated Hadramaut in the Yemeni kingdom. When al-Mutawakkil Isma'il died, the imamate was claimed by Ahmad. He had, however, to fight his cousin and rival al-Qasim who controlled Shaharah, an almost impregnable fortress north of San'a. Ahmad collected forces which besieged Shaharah and forced al-Qasim to accept his claim.[1]