0 ▁strong , ▁though ▁in ▁practice ▁these ▁were ▁strateg ically ▁placed ▁throughout ▁the ▁Empire . ▁With ▁Bas il ' s ▁rule , ▁the ▁By z antine ▁Empire ▁reached ▁its ▁greatest ▁height ▁in ▁nearly ▁five ▁centuries , ▁and ▁indeed ▁for ▁the ▁next ▁four ▁centuries . ▁ ▁Con clusion ▁The ▁wars ▁drew ▁near ▁to ▁a ▁closure ▁when ▁the ▁Tur ks ▁and ▁various ▁Mong ol ▁inv aders ▁replaced ▁the ▁threat ▁of ▁either ▁power . ▁From ▁the ▁ 1 1 th ▁and ▁ 1 2 th ▁centuries ▁on wards , ▁the ▁By z antine ▁conflicts ▁shift ed ▁into ▁the ▁By z antine - S el j uk ▁wars ▁with ▁the ▁continu ing ▁Islam ic ▁invasion ▁of ▁An atol ia ▁being ▁taken ▁over ▁by ▁the ▁Sel j uk ▁Tur ks . ▁ ▁After ▁the ▁defeat ▁at ▁the ▁Battle ▁of ▁Man zik ert ▁by ▁the ▁Tur ks ▁in ▁ 1 0 7 1 , ▁the ▁By z antine ▁Empire , ▁with ▁the ▁help ▁of ▁Western ▁Cr us aders , ▁re - est ab lished ▁its ▁position ▁in ▁the ▁Middle ▁East ▁as ▁a ▁major ▁power . ▁Meanwhile , ▁the ▁major ▁Arab ▁conflicts ▁were ▁in ▁the ▁Cr us ades , ▁and ▁later ▁against ▁Mong ol ian ▁invas ions , ▁especially ▁that ▁of ▁the ▁Il k han ate ▁and ▁Tim ur . ▁ ▁Effect s ▁ ▁As ▁with ▁any ▁war ▁of ▁such ▁length , ▁the ▁drawn - out ▁By z antine – A rab ▁Wars ▁had ▁long - last ing ▁effects ▁for ▁both ▁the ▁By z antine ▁Empire ▁and ▁the ▁Arab ▁world