peror ▁Frederick ▁Bar bar ossa . ▁T illed a ▁was ▁last ▁mentioned ▁as ▁an ▁Imperial ▁castle ▁in ▁ 1 1 9 4 , ▁when ▁Frederick ' s ▁son ▁Henry ▁VI ▁recon ci led ▁here ▁with ▁the ▁ins urg ent ▁W elf ▁du ke ▁Henry ▁the ▁Lion . ▁ ▁In ▁ 1 6 9 8 ▁Count ▁Albert ▁Anton ▁of ▁Schwar zburg - R ud ol stadt ▁had ▁a ▁Bar o que ▁hunting ▁l odge ▁ere cted ▁at ▁the ▁ham let ▁of ▁R ath sf eld ▁in ▁the ▁centre ▁of ▁the ▁Ky ff hä user ▁range . ▁Last ▁used ▁as ▁a ▁residence ▁by ▁Prince ▁Gün ther ▁Victor ▁of ▁Schwar zburg ▁after ▁his ▁ab dic ation ▁in ▁ 1 9 1 8 , ▁it ▁was ▁turned ▁into ▁a ▁recre ation ▁home ▁of ▁the ▁Ky ff hä user bund ▁veter ans ' ▁association ▁in ▁ 1 9 2 5 . ▁After ▁World ▁War ▁II ▁the ▁remote ▁site ▁became ▁a ▁Young ▁P ione er ▁camp ▁and ▁a ▁training ▁camp ▁of ▁the ▁East ▁German ▁Gesellschaft ▁für ▁Sport ▁und ▁Techn ik ; ▁since ▁German ▁reun ification , ▁the ▁empty ▁prem ises ▁have ▁decay ed . ▁ ▁Ky ff hä user ▁legend ▁ ▁According ▁to ▁a ▁king ▁as leep ▁in ▁mountain ▁legend , ▁Emperor ▁Frederick ▁Bar bar ossa , ▁who ▁actually ▁d rown ed ▁on ▁ 1 0 ▁June ▁ 1 1 9 0 ▁in ▁the ▁ ▁Cal yc ad n us ▁River ▁near ▁Sele u ke ia ▁in ▁Asia ▁Minor ▁during ▁the ▁Third ▁Cr us ade , ▁is ▁not ▁in