- M u qt ad ir ▁( ), ▁the ▁ha j ib ▁Nas r ▁al - K ush uri ▁became ▁a ▁major ▁power - bro ker , ▁since ▁he ▁occupied ▁his ▁post ▁continu ously ▁from ▁ 9 0 8 – 9 2 9 , ▁whereas ▁the ▁viz iers ▁changed ▁rapidly ▁during ▁this ▁period . ▁He ▁not ▁only ▁had ▁a ▁role ▁in ▁the ▁selection ▁of ▁several ▁viz iers , ▁but ▁also ▁was ▁responsible ▁for ▁arrest ing ▁them ▁when ▁they ▁were ▁dismiss ed . ▁ ▁After ▁ 9 2 9 , ▁the ▁command ers - in - ch ief ▁supp l anted ▁the ▁viz iers ▁in ▁power ▁and ▁began ▁domin ating ▁the ▁government , ▁becoming ▁the ▁main ▁riv als ▁of ▁the ▁ha j ib , ▁who ▁now ▁also ▁assumed ▁a ▁more ▁military ▁character . ▁Thus ▁the ▁ha j ib ▁Ya q ut ▁had ▁his ▁son ▁Muhammad ▁ibn ▁Ya q ut ▁appointed ▁sah ib ▁al - sh ur ta ▁in ▁his ▁rival ry ▁with ▁the ▁commander - in - ch ief ▁Mu ' nis ▁al - M u za ff ar , ▁before ▁they ▁were ▁both ▁dismiss ed ▁at ▁the ▁latter ' s ▁ins istence . ▁Under ▁al - Q ah ir ▁() ▁the ▁ha j ib ▁I bn ▁Y al ba q ▁was ▁a ▁soldier ▁who ▁tried ▁to ▁imp ose ▁his ▁pro - Sh i ' a ▁belief s ▁on ▁the ▁cal i ph . ▁Under ▁ar - Rad i , ▁Muhammad ▁ibn ▁Ya q ut ▁made ▁a ▁com eb ack , ▁combining ▁the ▁positions