ボレスワフ4世
It was not until 1157 that the emperor finally organized an expedition against Poland. It is unknown whether Bolesław, his brothers, or his father directly participated in the expedition. However, despite the military victory and the humiliating submission of High Duke Bolesław IV the Curly to Frederick Barbarossa, the emperor decided to maintain the rule of Bolesław IV and the junior dukes in Poland, and not to restore Władysław II to the throne. Two years later, on 30 May 1159, the disappointed former high duke died in his exile in Altenburg.