Jasko of Teczyn, Castellan of Krakow

 In the book Jasko of Teczyn is a Catellan of Krakow.

Jan (or Jasko) of Teczyn, (born between 1408–1410, died on July 6, 1470) - the castellan of Kraków in the years 1459–1470, the voivode of Kraków in the years 1438–1459, the voivode of Sandomierz in the years 1437–1438, the castellan of Wojnica in the years 1435–1437, guardian of the Kraków land in the years 1434–1436, the starost of Lublin in the years 1434–1438, the castellan of Biecz in the years 1433–1435.

For a quarter of a century, he was the most powerful magnate in Poland. It seems that the book's character is based on Jan, but the story itself takes place around 1410.