St. Casimir of Poland
Patron of Poland, Lithuania, young people
Saint Casimir of Poland (1458–1484) was the third of thirteen children born to King Casimir IV Jagiellon of Poland and Queen Elizabeth of Habsburg, daughter of the Holy Roman Emperor. Heir to one of the great dynasties of late medieval Europe, he was schooled by the chronicler Jan Długosz in classical learning, Sacred Scripture, and the duties of a Christian prince.