1 6 8 0 ▁to ▁ 1 7 0 1 ▁and ▁a ▁province ▁of ▁the ▁German ▁Kingdom ▁of ▁Pr uss ia ▁from ▁ 1 7 0 1 ▁to ▁ 1 8 0 7 . ▁It ▁replaced ▁the ▁Arch bishop ric ▁of ▁Mag de burg ▁after ▁its ▁sec ular ization ▁by ▁Brandenburg . ▁The ▁du chy ' s ▁capit als ▁were ▁Mag de burg ▁and ▁Halle , ▁while ▁Burg ▁was ▁another ▁important ▁town . ▁D iss ol ved ▁during ▁the ▁Napole onic ▁Wars ▁in ▁ 1 8 0 7 , ▁its ▁territory ▁was ▁made ▁part ▁of ▁the ▁Province ▁of ▁Sax ony ▁in ▁ 1 8 1 5 . ▁ ▁History ▁ ▁The ▁Roman ▁Catholic ▁Arch bishop ric ▁of ▁Mag de burg ▁began ▁to ▁be ▁admin ister ed ▁by ▁sec ular ▁princes , ▁mostly ▁Luther an , ▁in ▁ 1 5 4 5 ▁during ▁the ▁Protest ant ▁Re formation . ▁In ▁the ▁ 1 6 4 8 ▁Tre aty ▁of ▁West phal ia , ▁the ▁arch bishop ric ▁was ▁promised ▁to ▁the ▁House ▁of ▁H oh enz oll ern ▁of ▁the ▁Mar gra vi ate ▁of ▁Brandenburg ▁upon ▁the ▁death ▁of ▁its ▁inc umb ent ▁administrator , ▁August , ▁Duke ▁of ▁Sax e - We issen f els . ▁The ▁city ▁of ▁Mag de burg ▁was ▁also ▁required ▁to ▁pay ▁hom age ▁to ▁the ▁prince - elect ors ▁of ▁Brandenburg . ▁In ▁ 1 6 6 6 , ▁Elect or ▁Frederick ▁William ▁used ▁his ▁developing ▁army ▁to ▁install ▁a ▁permanent ▁Br anden burger ▁g arrison