In what year did Sigismund Casimir's mother die?
1644
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.
Cecilia Renata of Austria
Archduchess Cecilia Renata of Austria (German: "Cäcilia Renata"; Polish: "Cecylia Renata"; 16 July 1611 – 24 March 1644) was Queen of Poland as consort to the Polish-Lithuanian Commonwealth's King Władysław IV Vasa.
Saint Casimir
Saint Casimir Jagiellon (Polish: "Kazimierz" , Lithuanian: "Kazimieras" ; October 3, 1458 – March 4, 1484) was a prince of the Kingdom of Poland and of the Grand Duchy of Lithuania.
 Second oldest son of King Casimir IV, he was tutored by Johannes Longinus, a Polish chronicler and diplomat.
 After his elder brother Vladislaus was elected as King of Bohemia in 1471, Casimir became the heir apparent.
 At the age of 13, Casimir participated in the failed military campaign to install him as King of Hungary.
 He became known for his piousness, devotion to God, and generosity towards the sick and poor.
 He became ill (most likely with tuberculosis) and died at the age of 25.
 He was buried in Vilnius Cathedral and his cult grew.
 His canonization was initiated by his brother King Sigismund I the Old in 1514 and the tradition holds that he was canonized in 1521. Elizabeth of Austria (1436–1505)
Elizabeth of Austria (German: "Elisabeth" , Polish: "Elżbieta Rakuszanka" ; Lithuanian: "Elžbieta Habsburgaitė" ; c. 1436 – 30 August 1505) was the wife of King Casimir IV of Poland and thus Queen of Poland and Grand Duchess of Lithuania.
 Orphaned at an early age, she spent her childhood in the court of Holy Roman Emperor Frederick III.
 As one of the three surviving grandchildren of Emperor Sigismund, she had a strong claim to the kingdoms of Hungary and Bohemia.
 That made her an attractive bride for a Polish prince.
 The Polish nobility, seeking to increase Polish influence in Hungary and Bohemia, pursued marriage with Elizabeth since she was born and finally succeeded in 1454.
 Her marriage to Casimir was one of the most exemplary royal marriages in Poland.
 She gave birth to thirteen children, eleven of whom survived to adulthood.
 Four of her sons were crowned as kings. Michael Žygimantaitis
Michael Žygimantaitis (Lithuanian: "Mykolas Žygimantaitis" , Polish: "Michał Bolesław Zygmuntowicz" ; before 1406 – shortly before February 10, 1452 in Moscow) was the last male descendant of Kęstutis, Grand Duke of Lithuania.
 He supported his father Sigismund Kęstutaitis in power struggles with Švitrigaila.
 In 1435 he led his father's army to victory in the Battle of Pabaiskas.
 After his father's assassination in 1440, Michael unsuccessfully fought against Casimir IV Jagiellon for the title of the Grand Duke of Lithuania.
 At first Michael was supported by Samogitia, but in 1441 Casimir issued a privilege confirming Samogitia's semi-autonomous status and thus avoiding a civil war.
 Until 1447 he was supported by Dukes of Masovia.
 In 1448 Michael asked help from the Crimean Khanate.
 With their help he attacked and shortly took control of Kiev, Starodub, Novhorod-Siversky.
 Soon he was captured and transported to the Grand Duchy of Moscow where he died under unclear circumstances (possibly poisoned).
 He was buried in Vilnius Cathedral. Barbara Zápolya
Barbara Zápolya (1495–1515) was Queen of Poland and Grand Duchess of Lithuania as the first wife of King Sigismund I the Old.
 Marriage to Barbara represented an alliance between Sigismund and the House of Zápolya against the Habsburgs in succession disputes over the throne to the Kingdom of Hungary.
 The alliance was short-lived as the renewed Muscovite–Lithuanian War forced Sigismund to look for Habsburg allies.
 The marriage was loving, but short.
 Barbara was the mother of Hedwig, Electress of Bradenburg, but died soon after the birth of her second daughter Anna. Chapel of Saint Casimir
The Chapel of Saint Casimir is a chapel dedicated to Saint Casimir in Vilnius Cathedral.
 The chapel was built in 1623–36 after Prince Casimir (1458–1484) was canonized as saint.
 It was built and decorated in the Baroque style by Italian sculptors and architects commissioned by Sigismund III Vasa, King of Poland and Grand Duke of Lithuania.
 The centerpiece of the chapel is a faux marble altar which holds the silver sarcophagus with Casimir's remains and the painting "Three-Handed St. Casimir". 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. Sigismund Rákóczi
Sigismund Rákóczi (Hungarian: "Rákóczi Zsigmond" ; 1544 – 5 December 1608) was Prince of Transylvania from 1607 to 1608.
 He was the son of János Rákóczi, a lesser nobleman with estates in Upper Hungary.
 Sigismund began a military career as sword-bearer of the wealthy Gábor Perényi in Sárospatak.
 After Perényi died in 1567, Sigismund served in the royal fortresses of Eger and Szendrő.
 The royal chamber mortgaged him several estates to compensate him for unpaid salaries.
 He received Szerencs in 1580, which enabled him to engage in the lucrative Tokaji wine trade.
 He took possession of the large estates of András Mágóchy's minor sons as their guardian, and the second husband of their mother Judit Alaghy, in 1587. Catherine of Bosnia (princess)
Catherine of Bosnia (Bosnian: "Katarina Tomašević Kotromanić" /Катарина Томашевић Котроманић; born in 1453) was a member of the House of Kotromanić and the last Bosnian princess.
 She was the only daughter of King Thomas and Queen Catherine, who also had a son named Sigismund.
 When Thomas died, in July 1461, the Bosnian crown devolved upon her older half-brother, Stephen Tomašević.
 Catherine and Sigismund are popularly said to have moved at that time with their mother to the castle of Kozograd above Fojnica.
 It is likely, however, that they remained at the royal court in Jajce, being their half-brother's closest heirs.
 In 1463, the Ottomans led by Mehmed the Conqueror invaded Bosnia.
 The royal family apparently decided to split and flee towards Croatia proper and the coast in different directions to confuse and mislead the invaders.
 Sigismund and Catherine, separated from their mother, were nevertheless captured in the town of Zvečaj, close to Jajce.
 Their half-brother the King was deceived into surrendering in Ključ, and was executed shortly afterwards.
 Queen Catherine succeeded in escaping and eventually settled in Rome.