St. Casimir the Peacemaker of Poland

St. Casimir the Peacemaker was born in 1458.  St. Casimir the Peacemaker's father was Casimir IV of Poland King of Poland.  His paternal grandparents were Wladyslaw II Jagiello King of Poland and Jadwiga Queen of Poland Poland. He had four brothers and two sisters, named Alexander of Poland, John I Albert of Poland, Sigismund I the Elder, Ulászló II of Bohemia, Sophie and Barbara.  He died at the age of 26 in 1484.