Frederick Jagiellon, Primate of Poland (d. 1503)
Frederick Jagiellon (Polish: Fryderyk Jagiellończyk; 27 April 1468 – 14 March 1503) was a Polish prince, Archbishop of Gniezno, Bishop of Kraków, and Primate of Poland. He was the sixth son and ninth child of Casimir IV Jagiellon, King of Poland and Grand Duke of Lithuania, and his wife Elizabeth of Austria, known as 'Matka Jagiellonów' (Mother of the Jagiellons).
Frederick ruled two dioceses with devotion. He cared about the cult of saints, the appropriate education of the clergy, took care of the liturgical life, carried out the diocesan and provincial synods. He also cared about the liturgy, foundations, and restoring of churches, including the restoration of the Kraków and Gniezno Cathedrals.