Ujście in the context of "Piła County"

Bolesław the Pious (1224/27 – 14 April 1279) was a Duke of Greater Poland during 1239–1247 (according to some historians during 1239–1241, sole Duke of Ujście), Duke of Kalisz during 1247–1249, Duke of Gniezno during 1249–1250, Duke of Gniezno-Kalisz during 1253–1257, Duke of the whole of Greater Poland and Poznań during 1257–1273, in 1261 ruler over Ląd, regent of the Duchies of Mazovia, Płock and Czersk during 1262–1264, ruler over Bydgoszcz during 1268–1273, Duke of Inowrocław during 1271–1273, and Duke of Gniezno-Kalisz from 1273 until his death.

He was the second son of Władysław Odonic, Duke of Greater Poland by his wife Jadwiga, who was probably the daughter of Mestwin I, Duke of Pomerania, or a member of the Přemyslid dynasty. His name was very popular in the Piast dynasty, so it is unknown exactly after whom he was named. Very soon Bolesław received the nickname of "the Pious" (Latin: Pius, Polish: Pobożny), given to him during his lifetime by the Chronicle of the Chapter of Poznań. In 1264, Bolesław granted the first written privilege to the Jews of Greater Poland.

Władysław Odonic, nicknamed Plwacz or the Spitter, (c. 1190 – 5 June 1239) was a duke of Kalisz 1207–1217, duke of Poznań 1216–1217, ruler of Ujście in 1223, ruler of Nakło from 1225, and duke of all Greater Poland 1229–1234; from 1234 until his death he was ruler over only the north and east of the Warta river (some historians believed that shortly before his death, he lost Ujście and Nakło).

He was a son of Duke Odon of Kalisz by his wife Viacheslava, daughter of Prince Yaroslav Osmomysl of Halych. Władysław was probably named after either his paternal uncle Władysław III Spindleshanks or his ancestor Władysław I Herman.