▁ar isen ▁in ▁K hor as an . ▁ ▁Abb as id ▁Revolution ▁and ▁fall ▁ ▁The ▁Hash imi y ya ▁movement ▁( a ▁sub - sect ▁of ▁the ▁K ays an ites ▁Sh ia ), ▁led ▁by ▁the ▁Abb as id ▁family , ▁over th rew ▁the ▁Um ay y ad ▁cal i ph ate . ▁The ▁Abb as ids ▁were ▁members ▁of ▁the ▁Hash im ▁cl an , ▁riv als ▁of ▁the ▁Um ay y ads , ▁but ▁the ▁word ▁" Hash imi y ya " ▁seems ▁to ▁refer ▁specifically ▁to ▁Ab u ▁Hash im , ▁a ▁grand son ▁of ▁Ali ▁and ▁son ▁of ▁Muhammad ▁ibn ▁al - H ana fi y ya . ▁According ▁to ▁certain ▁trad itions , ▁Ab u ▁Hash im ▁died ▁in ▁ 7 1 7 ▁in ▁H ume ima ▁in ▁the ▁house ▁of ▁Muhammad ▁ibn ▁Ali , ▁the ▁head ▁of ▁the ▁Abb as id ▁family , ▁and ▁before ▁dying ▁named ▁Muhammad ▁ibn ▁Ali ▁as ▁his ▁successor . ▁This ▁tradition ▁allowed ▁the ▁Abb as ids ▁to ▁r ally ▁the ▁supp or ters ▁of ▁the ▁failed ▁revol t ▁of ▁M uk ht ar , ▁who ▁had ▁represented ▁themselves ▁as ▁the ▁supp or ters ▁of ▁Muhammad ▁ibn ▁al - H ana fi y ya . ▁ ▁Begin ning ▁around ▁ 7 1 9 , ▁Hash imi y ya ▁miss ions ▁began ▁to ▁seek ▁ad her ents ▁in ▁Kh uras an . ▁Their ▁campaign ▁was ▁fr amed ▁as ▁one ▁of ▁pros ely t ism ▁( da w ah ). ▁They