 The senioral principle was soon broken, with Władysław II attempting to increase his power and his younger half-brothers opposing him.After initial success (taking over the Łęczyca Land after the death of Salomea), he was eventually defeated and expelled from Poland in 1146.With the help of Emperor Frederick I Barbarossa his sons managed to retain the Silesian Province in 1163, losing the Seniorate, which had passed to their uncle Bolesław IV.