Janusz II of Płock

After their father's death, Janusz II and his siblings where place under the guardianship of their mother Barbara and Paweł Giżycki, Bishop of Płock.

In foreign policy, Janusz II, in addition to his close cooperation with his brothers (especially with Bolesław V, with for many years had a co-rulership), he tried to limit the growing influence of the Jagiellonian dynasty.

In 1476 Janusz II together with his brother Bolesław V protested against the incorporation of Sochaczew (who was held by Anna of Oleśnica, widow of Władysław I, as a part of her Qprawa wdowia) to the Polish Kingdom by sending his troops to the disputed city.

On 7 August 1492 King Casimir IV of Poland died, and the Dukes of Masovia (who wanted to escape from the shadow of the Jagiellonian dynasty) proposed Janusz II as candidate for the crown.

However, when Janusz II arrived to Kraków, it was certain that his candidacy for the throne was futile and Casimir IV's son, John I Albert, was elected new King.