Duchy of Jawor
In the 1270s, Bolesław gave more and more power to his adolescent sons. In 1273 he granted the Duchy of Jawor to his oldest son Henry V and it seemed that Bolesław had resigned from adventurous politics. Nevertheless, in 1277, he signed an alliance with King Rudolph I of Germany, straining the alliance of the other Piast dukes with rivalling King Ottokar II of Bohemia. At Rudolph's insistence, Bolesław kidnapped Ottokar's ally, Duke Henry IV of Wrocław, Bolesław's nephew, and demanded one-third of Wrocław after the death of his uncle Władysław, Bolesław's youngest brother, in 1270. Henry IV was imprisoned in Legnica Castle.