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.
Treaty of Vilnius (1559) The Treaty of Vilnius or Vilna was concluded on 31 August 1559, during the Livonian War, between the Livonian Order and the Polish-Lithuanian Commonwealth at Vilnius (Vilna, Wilna, Wilno). Gotthard von Kettler put the lands of the order under protection of Polish king and Grand Duke of Lithuania, Sigismund II Augustus. The alliance was intended to neutralize the imminent threat of annexation of the order's lands by Russia, yet despite earning military support from Polish-Lithuanian chancellor Mikołaj "the Black" Radziwiłł, Kettler was unable to prevent the occupation of most of Livonia by Russian forces. Thus, Kettler concluded a second treaty with Poland-Lithuania on 28 November 1561, transferring the remnants of the Teutonic Order State to the Polish Crown and the Grand Duchy of Lithuania, himself becoming a vassal of Sigismund II Augustus.