In 1232 he became High Duke of Poland, and as he was able to secure the succession of his son Henry II the Pious upon his death in 1238, it seemed that the Polish fragmentation could be overcome and the will of Bolesław III Krzywousty would finally be fulfilled.
Aastal 1232 sai temast Poola ülemhertsog, ja kui ta suutis tagada oma poja Henryk II Pobożny pärandi pärast oma surma aastal 1238, näis, et Poola killustatus on läbi saamas ja Bolesław III Krzywousty viimne soov täidetakse lõpuks.