ボレスワフ4世
The history of the Silesian Piasts began with the feudal fragmentation of Poland in 1138 following the death of the Polish duke Bolesław III Wrymouth. While the Silesian province and the Kraków seniorate were assigned to Władysław II the Exile, his three younger half–brothers Bolesław IV the Curly, Mieszko III the Old, and Henry of Sandomierz received Masovia, Greater Poland and Sandomierz, respectively, according to the Testament of Boleslaw III.