▁from ▁three ▁pag i , ▁under ▁the ▁juris diction ▁of ▁four ▁counts , ▁who , ▁however , ▁were ▁to ▁have ▁no ▁rights ▁to ▁demand ▁castle work ▁from ▁them . ▁ ▁Str ife ▁and ▁decl ine ▁In ▁the ▁In vest iture ▁Cont ro vers y , ▁the ▁ab bot ▁of ▁Cor vey ▁took ▁a ▁stand ▁with ▁the ▁Sax on ▁nobles ▁against ▁Henry ▁IV , ▁Holy ▁Roman ▁Emperor . ▁Its ▁ab bot ▁Mark ward ▁( ser ved ▁ 1 0 8 1 – 1 1 0 7 ), ▁" without ▁doubt ▁one ▁of ▁the ▁most ▁important ▁abb ots ▁of ▁the ▁thousand - year ▁history ▁of ▁the ▁ab bey " ▁( K amin sky ), ▁and ▁his ▁successor ▁Er ken bert ▁( 1 1 0 7 – 2 8 ) ▁saw ▁the ▁ab bey ▁through ▁the ▁critical ▁period . ▁ ▁The ▁ab bey ▁also ▁participated ▁in ▁attempts ▁to ▁reform ▁the ▁Catholic ▁Church ▁during ▁the ▁ 1 1 th ▁century . ▁It ▁was ▁the ▁dominant ▁the ological ▁centre ▁in ▁the ▁region ▁and ▁established ▁numerous ▁subs idi ary ▁ab be ys . ▁ ▁A ▁final ▁period ▁of ▁prosper ity ▁followed ▁under ▁the ▁leadership ▁of ▁W ib ald ▁( ab bot ▁from ▁ 1 1 4 6 – 5 8 ). ▁At ▁that ▁time , ▁the ▁West werk ▁was ▁re construct ed ▁in ▁the ▁High ▁Roman es que ▁style , ▁and ▁the ▁Carol ing ian ▁three - t ower ▁set - up ▁was ▁replaced ▁with ▁tw in ▁to wers . ▁By ▁the ▁mid - 1 2 th ▁century ,