Cardinal, politician born in Sienna in 1389, died in Sandomierz in 1455. He graduated from the Krakow Academy, secretary of King Władysław Jagiełło, whom he saved his life at Grunwald in 1410. In 1411, an envoy to the conciliar Pope John XXIII, in 1420 the priest of the church of St. Florian in Kraków, in 1423 the bishop of Kraków, from 1249 a cardinal, the first prince of Siewierz. Outstanding individuality, the leader of the conservative faction of the magnates, the opponent of the strengthening of royal power, the opponent of the incorporation of Prussia, exerted a huge influence on the matters of government in the country, which only ceased during the reign of Kazimierz Jagiellończyk.