His five sons: Henry IV, Konrad I, Jan, Boleslaw and Przemko, soon split between them the inheritance of his father and led to the decline of the Duchy.
Kelima putranya: Henryk IV, Konrad I, Jan, Bolesław dan Przemko, segera membagi di antara mereka warisan ayahandanya dan menyebabkan kemunduran Kadipaten.