s , ▁persistent ▁divisions ▁along ▁Q ays – Y aman ▁lines ▁contributed ▁to ▁the ▁army ' s ▁massive ▁rout ▁and ▁U bay d ▁Al lah ' s ▁death ▁at ▁the ▁hands ▁of ▁the ▁pro - Al id ▁forces ▁of ▁M uk ht ar ▁al - Th a q af i ▁of ▁K uf a ▁at ▁the ▁Battle ▁of ▁Kh az ir ▁in ▁August ▁ 6 8 6 . ▁The ▁set back ▁delayed ▁Abd ▁al - Mal ik ' s ▁attempts ▁to ▁re est ab lish ▁Um ay y ad ▁authority ▁in ▁Ira q , ▁while ▁press ures ▁from ▁the ▁By z antine ▁Empire ▁and ▁ra ids ▁into ▁Sy ria ▁by ▁the ▁By z ant ines ' ▁M arda ite ▁al lies ▁comp elled ▁him ▁to ▁sign ▁a ▁peace ▁treat y ▁with ▁By z ant ium ▁in ▁ 6 8 9 ▁which ▁substantial ly ▁increased ▁the ▁Um ay y ads ' ▁annual ▁t ribute ▁to ▁the ▁Empire . ▁During ▁his ▁sie ge ▁of ▁Cir ces ium ▁in ▁ 6 9 1 , ▁Abd ▁al - Mal ik ▁recon ci led ▁with ▁Z uf ar ▁and ▁the ▁Q ays ▁by ▁offering ▁them ▁privile ged ▁positions ▁in ▁the ▁Um ay y ad ▁court ▁and ▁army , ▁signal ing ▁a ▁new ▁policy ▁by ▁the ▁cal i ph ▁and ▁his ▁success ors ▁to ▁balance ▁the ▁interests ▁of ▁the ▁Q ays ▁and ▁Y aman ▁in ▁the ▁Um ay y ad ▁state . ▁With ▁his ▁un ified ▁army , ▁Abd ▁al - Mal ik ▁march ed ▁against ▁the ▁Z ub