Through a mediation of Baldwin, Bishop of Kraków, a peace treaty was signed at Łęczyca, in which Zbigniew officially recognized Bolesław as the Supreme Prince of all Poland.
Melalui mediasi Baldwin, Uskup Kraków, sebuah perjanjian damai ditandatangani di Łęczyca, dimana Zbigniew dengan resmi mengakui Bolesław sebagai Pangeran Agung di seluruh Polandia.