, ▁was ▁not ▁to ▁help ▁W ład ys ław ▁II , ▁but ▁instead ▁to ▁march ▁against ▁Rome ▁and ▁be ▁crown ed ▁em peror . ▁B oles ław ▁accompanied ▁him . ▁ ▁Ex ped ition ▁of ▁Frederick ▁Bar bar ossa ▁to ▁Poland ▁It ▁was ▁not ▁until ▁ 1 1 5 7 ▁that ▁the ▁em peror ▁finally ▁organized ▁an ▁expedition ▁against ▁Poland . ▁It ▁is ▁unknown ▁whether ▁B oles ław , ▁his ▁brothers , ▁or ▁his ▁father ▁directly ▁participated ▁in ▁the ▁expedition . ▁However , ▁despite ▁the ▁military ▁victory ▁and ▁the ▁hum ili ating ▁submission ▁of ▁High ▁Duke ▁B oles ław ▁IV ▁the ▁Cur ly ▁to ▁Frederick ▁Bar bar ossa , ▁the ▁em peror ▁decided ▁to ▁maintain ▁the ▁rule ▁of ▁B oles ław ▁IV ▁and ▁the ▁junior ▁du kes ▁in ▁Poland , ▁and ▁not ▁to ▁restore ▁W ład ys ław ▁II ▁to ▁the ▁throne . ▁Two ▁years ▁later , ▁on ▁ 3 0 ▁May ▁ 1 1 5 9 , ▁the ▁disappoint ed ▁former ▁high ▁du ke ▁died ▁in ▁his ▁ex ile ▁in ▁Al ten burg . ▁ ▁Rest oration ▁of ▁the ▁S iles ian ▁inheritance ▁Despite ▁his ▁diss atisf action ▁at ▁the ▁em peror ' s ▁treatment ▁of ▁his ▁father , ▁B oles ław ▁remained ▁at ▁the ▁side ▁of ▁the ▁em peror , ▁particip ating ▁in ▁his ▁many ▁wars . ▁From ▁ 1 1 5 8 - 1 1 6 2 ▁he ▁took ▁part ▁in ▁the ▁Bar bar ossa ' s ▁expedition ▁to ▁Italy , ▁where ▁he ▁won ▁fame ▁after ▁killing ▁a ▁well -