Who was married to Sigismund III Vasa, and mother to Władysław IV Vasa?
Constance of Austria: Constance of Austria (German: "Konstanza" ; Polish: "Konstancja" ; 24 December 1588 – 10 July 1631) was queen of Poland as the second wife of King Sigismund III Vasa and the mother of King John II Casimir.
i don't know