▁Z ab , ▁and ▁the ▁Um ay y ads ▁were ▁defeated . ▁Dam asc us ▁fell ▁to ▁the ▁Abb as ids ▁in ▁April , ▁and ▁in ▁August , ▁Mar wan ▁was ▁killed ▁in ▁Egypt . ▁ ▁The ▁vict ors ▁des ec r ated ▁the ▁tomb s ▁of ▁the ▁Um ay y ads ▁in ▁Sy ria , ▁sp aring ▁only ▁that ▁of ▁U mar ▁II , ▁and ▁most ▁of ▁the ▁remaining ▁members ▁of ▁the ▁Um ay y ad ▁family ▁were ▁track ed ▁down ▁and ▁killed . ▁When ▁Abb as ids ▁declared ▁am n esty ▁for ▁members ▁of ▁the ▁Um ay y ad ▁family , ▁eight y ▁gathered ▁to ▁receive ▁p ard ons , ▁and ▁all ▁were ▁mass ac red . ▁One ▁grand son ▁of ▁H ish am , ▁Abd ▁al - R ah man ▁I , ▁surv ived , ▁escaped ▁across ▁North ▁Africa , ▁and ▁established ▁an ▁em ir ate ▁in ▁Mo or ish ▁I ber ia ▁( Al - And alus ). ▁In ▁a ▁claim ▁un recogn ized ▁outside ▁of ▁al - And alus , ▁he ▁maintained ▁that ▁the ▁Um ay y ad ▁C ali ph ate , ▁the ▁true , ▁authentic ▁cal i ph ate , ▁more ▁legit imate ▁than ▁the ▁Abb as ids , ▁was ▁continued ▁through ▁him ▁in ▁C ór dob a . ▁It ▁was ▁to ▁surv ive ▁for ▁centuries . ▁ ▁Pre v ité - Or ton ▁arg ues ▁that ▁the ▁reason ▁for ▁the ▁decl ine ▁of ▁the ▁Um ay y ads ▁was ▁the ▁rapid ▁expansion ▁of ▁Islam .