In what year did Sigismund Casimir's mother die?
Sigismund Casimir Sigismund Casimir, Crown Prince of Poland (Polish: "Zygmunt Kazimierz Waza" ), (1 April 1640 – 9 August 1647) - was the only legitimate son of King Władysław IV and his first wife Queen Cecilia Renata. He was named after his grandfather Sigismund III, and uncle John Casimir.
Judith of Poland Judith of Poland (Polish: Judyta Bolesławówna , Hungarian: Judit lengyel hercegnő , German: Judith von Polen ; b. 1130/35 – died 8 July 1171/75), was a Polish princess member of the House of Piast and by marriage Margravine of Brandenburg.