▁of ▁Hal ber stadt . ▁It ▁was ▁v ested ▁with ▁market ▁rights ▁by ▁King ▁Otto ▁III ▁in ▁ 9 8 9 . ▁The ▁town ▁became ▁the ▁administrative ▁centre ▁of ▁the ▁Sax on ▁Har z g au ▁and ▁an ▁important ▁trad ing ▁location . ▁The ▁Hal ber stadt ▁b ish ops ▁had ▁the ▁Church ▁of ▁Our ▁Lady ▁ere cted ▁from ▁about ▁ 1 0 0 5 ▁on wards . ▁In ▁his ▁fier ce ▁conflict ▁with ▁Emperor ▁Frederick ▁Bar bar ossa , ▁the ▁forces ▁of ▁the ▁Sax on ▁du ke ▁Henry ▁the ▁Lion ▁dev ast ated ▁the ▁town ▁in ▁ 1 1 7 9 . ▁ ▁Upon ▁Henry ' s ▁down fall , ▁the ▁Hal ber stadt ▁dioc ese ▁was ▁elev ated ▁to ▁a ▁prince - bishop ric ▁about ▁ 1 1 8 0 . ▁Its ▁C athedral ▁was ▁re built ▁from ▁ 1 2 3 6 ▁and ▁consec r ated ▁in ▁ 1 4 9 1 . ▁Hal ber stadt , ▁Qu ed lin burg ▁and ▁A sch ers leben ▁joined ▁a ▁league ▁of ▁towns ▁( H al ber st äd ter ▁Dre ist äd te bund ) ▁in ▁ 1 3 2 6 ; ▁from ▁ 1 3 8 7 , ▁the ▁city ▁was ▁also ▁a ▁member ▁of ▁the ▁Han se . ▁ ▁From ▁ 1 4 7 9 , ▁the ▁dioc ese ▁was ▁administr ated ▁by ▁the ▁Arch b ish ops ▁of ▁Mag de burg . ▁While ▁the ▁Hal ber stadt ▁citizens ▁turned ▁Protest ant ▁around ▁ 1 5 4 0 ,