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. <SEP> Sigismund Casimir was a brunette.
Siggy Casimir, Crown Princex of Poland (Polish: "Zyggi Kazimierz Waza"), (1 April 1640-9 August 1647)- was the only legitimate child of King Władysław IV and his first wife Queen Cecilia Renata. They were named after their grandfather Sigismund III, and uncle John Casimir. <SEP> Siggy Casimir was a brunette.