y ib i ▁Is ma ' ili ▁D ā ʿ ī ▁al - M u ṭ la q ▁in ▁Y emen , ▁from ▁ 1 2 3 0 ▁to ▁his ▁death ▁in ▁ 1 2 6 8 . ▁ ▁Life ▁He ▁was ▁the ▁son ▁of ▁the ▁fifth ▁D ā ʿ ī , ▁Ali ▁ibn ▁Muhammad ▁ibn ▁al - W al id , ▁and ▁thus ▁a ▁member ▁of ▁the ▁Ban u ▁al - W al id ▁al - An f ▁family , ▁that ▁domin ated ▁the ▁office ▁of ▁D ā ʿ ī ▁al - M u ṭ la q ▁almost ▁continu ously ▁in ▁the ▁ 1 3 th ▁to ▁early ▁ 1 6 th ▁centuries . ▁The ▁position ▁of ▁D ā ʿ ī ▁al - M u ṭ la q ▁(" absolute / un rest rict ed ▁mission ary ") ▁was ▁the ▁supre me ▁authority ▁of ▁the ▁T ay y ib i ▁community ▁in ▁their ▁capacity ▁as ▁vic eg er ents ▁of ▁the ▁absent ▁Im am , ▁the ▁e pon ym ous ▁at - T ay y ib ▁Ab u ' l - Q as im , ▁who ▁remained ▁in ▁occ ult ation . ▁ ▁Like ▁his ▁father , ▁al - H us ay n ▁had ▁close ▁relations ▁with ▁the ▁Ras ul id ▁dynast y ▁of ▁S ana ' a , ▁and ▁converted ▁several ▁of ▁their ▁members ▁to ▁T ay y ib i ▁Is ma ' il ism , ▁as ▁well ▁as ▁the ▁Ban u ▁Hat im ▁branch ▁of ▁the ▁Ham dan id ▁dynast