ボレスワフ4世
Upon the exile of High Duke Władysław II the rule was assumed by Władysław's II eldest brother Bolesław IV the Curly, Duke of Masovia, who died without issue in 1173. He was followed in the Seniorate by the second eldest Mieszko III the Old, while Masovia and the Kuyavian lands passed to Bolesław's IV minor son Leszek.