After the death of their father on 11/12 December 1455, Władysław II and his brother Siemowit VI inherited their domains; however, because at that moment they are minors, the regency was held by their mother and Paweł Giżycki, Bishop of Płock.
After the death of Siemowit VI on 31 December 1461/1 January 1462, Władysław II became in the sole ruler of their paternal domains; however, because he was still a minor, the regency was taken again by the Dowager Duchess Anna and Bishop Paweł of Płock.
This was vigorously opposed by the late princes' aunt Catherine and the majority of the Masovian nobility; at the end, the Polish King was able to annex only Belz, Rawa Mazowiecka and Gostynin, while Płock, Płońsk and Zawkrze were taken by Konrad III the Red, member of the Warsaw line and the closest male relative.
The lands taken by the Warsaw Piasts remained in their hands, although King Casimir IV capture the main fortress of Płock and forced the local nobility to paid homage to him.
At the end, and for unknown reasons, the King didn't use the force to capture the lands, probably because he found extremely difficult to break the resistance of the local nobility, still deeply attached to the Piast dynasty.