known ▁Italian ▁kn ight ▁in ▁a ▁du el ▁on ▁the ▁walls ▁of ▁Milan . ▁ ▁B oles ław ' s ▁faithful ▁service ▁to ▁the ▁em peror ▁was ▁finally ▁reward ed ▁in ▁ 1 1 6 3 , ▁when ▁Bar bar ossa ▁succeeded ▁through ▁diplom acy ▁in ▁rest oring ▁to ▁the ▁descend ants ▁of ▁W ład ys ław ▁II ▁their ▁inheritance ▁over ▁S iles ia . ▁By ▁an ▁agreement ▁signed ▁in ▁N ure m berg , ▁Germany , ▁B oles ław ▁IV ▁agreed ▁to ▁accept ▁the ▁return ▁of ▁the ▁ex iled ▁princes . ▁He ▁did ▁so ▁because , ▁after ▁the ▁death ▁of ▁W ład ys ław ▁II , ▁his ▁sons ▁could ▁not ▁directly ▁challenge ▁his ▁authority ▁as ▁the ▁senior ▁du ke , ▁and ▁they ▁had ▁not ▁yet ▁established ▁any ▁support ▁within ▁Poland . ▁In ▁addition , ▁se ating ▁them ▁would ▁satisfy ▁ ▁Bar bar ossa ▁and ▁thus ▁keep ▁him ▁away ▁from ▁Poland . ▁However ▁B oles ław ▁IV ▁decided ▁to ▁maintain ▁the ▁security ▁of ▁his ▁lands ▁and ▁retain ▁the ▁control ▁over ▁the ▁main ▁S iles ian ▁cities ▁of ▁W roc law , ▁O pole , ▁Ra ci b ór z , ▁G ł og ów , ▁and ▁Leg nica . ▁ ▁After ▁almost ▁ 1 6 ▁years ▁of ▁ex ile , ▁B oles ław ▁returned ▁to ▁S iles ia ▁with ▁his ▁second ▁wife , ▁Christ ina ▁( Z ven is lava ▁had ▁died ▁around ▁ 1 1 5 5 ); ▁his ▁elder ▁children , ▁Jar os ław ▁and ▁Ol ga ; ▁and ▁his ▁younger