▁K har istan ▁and ▁turning ▁back ▁the ▁T urg esh ▁army . ▁later ▁after ▁As ad ' s ▁death ▁a ▁few ▁months ▁later , ▁this ▁success ▁was ▁instrument al ▁in ▁pres erving ▁Muslim ▁rule ▁in ▁Central ▁Asia , ▁as ▁the ▁blow ▁to ▁the ▁k h agan   ' s ▁prest ige ▁led ▁to ▁his ▁murder ▁soon ▁there after ▁and ▁the ▁collapse ▁of ▁T urg esh ▁power . ▁At ▁the ▁same ▁time , ▁As ad ' s ▁conc ili atory ▁policy ▁towards ▁the ▁native ▁population ▁laid ▁the ▁found ations ▁for ▁its ▁event ual ▁accept ance ▁of ▁Muslim ▁rule ▁and ▁the ▁Islam ization ▁of ▁Central ▁Asia . ▁ ▁In ▁ 7 2 4 , ▁immediately ▁after ▁the ▁rise ▁of ▁H ish am ▁ibn ▁Abd ▁al - Mal ik ▁( r . ▁ 7 2 4 – 7 4 3 ) ▁to ▁the ▁throne , ▁As ad ' s ▁brother ▁K hal id ▁al - Q as ri ▁was ▁appointed ▁to ▁the ▁important ▁post ▁of ▁governor ▁of ▁Ira q , ▁with ▁responsibility ▁over ▁the ▁entire ▁Islam ic ▁East , ▁which ▁he ▁held ▁until ▁ 7 3 8 . ▁K hal id ▁in ▁turn ▁named ▁As ad ▁as ▁governor ▁of ▁Kh uras an . ▁The ▁two ▁brothers ▁thus ▁became , ▁according ▁to ▁Pat ric ia ▁Cr one , ▁" am ong ▁the ▁most ▁prominent ▁men ▁of ▁the ▁Mar wan id ▁period ". ▁As ad ' s ▁arrival ▁in ▁Kh uras an ▁found ▁the ▁province ▁in ▁per il : ▁his ▁prede cess or , ▁Muslim ▁ibn ▁Sa '