page_title: John II Casimir Vasa
section_title: Early life, family and rise to power
hierarchical_section_title: John II Casimir Vasa / Biography / Early life, family and rise to power
context_page_description: John II Casimir was King of Poland and Grand Duke of Lithuania from 1648 until his abdication in 1668 as well as titular King of Sweden from 1648 until 1660. He was the second son of Sigismund III Vasa and Constance of Austria. His older brother and predecessor on the throne was Władysław IV Vasa.
  As a prince, John Casimir embarked at Genoa for Spain in 1638 to negotiate a league with Philip IV against France, but was captured by Cardinal Richelieu and imprisoned at Vincennes where he remained for two years. He was released when his brother, Władysław IV, promised never to wage war against France. John Casimir then travelled extensively throughout western Europe and entered the order of Jesuits in Rome in 1643. He was made cardinal by Innocent X, however, after returning to Poland, he became a layman and succeeded his brother in 1648. His reign commenced amid the confusion and disasters caused by the great revolt of the Cossacks under Bohdan Khmelnytsky in Ukraine, who had advanced into the very heart of Poland. The power of the king had been stripped of almost all its prerogatives by the growing influence of the nobles.
context_section_description: John Casimir was born in Kraków on 22 March 1609. His father, Sigismund III, the grandson of Gustav I of Sweden, had in 1592 succeeded his own father to the Swedish throne, only to be deposed in 1599 by his uncle, Charles IX of Sweden. This led to a long-standing feud wherein the Polish kings of the House of Vasa claimed the Swedish throne, resulting in the Polish–Swedish War of 1600–1629. Poland and Sweden were also on opposite sides in the Thirty Years' War (1618–1648), although in that conflict Poland for the most part avoided joining any major military actions and campaigns, instead supporting the Austrian Habsburg and Catholic fraction. His mother, Queen Constance, was the daughter of Charles II of Austria and Maria Anna of Bavaria and also the younger sister of Ferdinand II, Holy Roman Emperor.
  John Casimir for most of his life remained in the shadow of his older half-brother, Władysław IV Vasa. He had few friends among the Polish nobility. Unfriendly, secretive, dividing his time between lavish partying and religious contemplation, and disliking politics, he did not have a strong power base nor influence at the Polish court, instead supporting unfavorable Habsburg policies. He did, however, display talent as a military commander, showing his abilities in the Smolensk War against Muscovy (1633).
  Between 1632 and 1635, Władysław IV sought to enhance his brother's influence by negotiating a marriage for John Casimir to Christina of Sweden, then to an Italian princess, but to no avail. In 1637 John Casimir undertook a diplomatic mission to Vienna, which he abandoned to join the army of the Holy Roman Empire and fight against the French. After his regiment was defeated in battle, he spent a year living lavishly at the Viennese court where his strong anti-Cossack interests and political views were greatly shaped under the direct influence of the Austrian Emperor. 
  In 1636 he returned to the Polish–Lithuanian Commonwealth and fell in love with Baroness Guldentern, but his desire to marry her was thwarted by King Władysław. In return, Władysław attempted to make him the sovereign of the Duchy of Courland, but this was vetoed by the Commonwealth parliament (Sejm). Taking offence at this, John Casimir in 1638 left for the Kingdom of Spain to become Viceroy of Portugal, but was captured by French agents and imprisoned by the order of Cardinal Richelieu until 1640. He was then freed by a diplomatic mission of the appointed Voivode of Smolensk, Krzysztof Gosiewski.
  In 1641 John Casimir decided to become a Jesuit. In 1642 he again left the Polish–Lithuanian Commonwealth, accompanying his sister to Germany. In 1643 he joined the Jesuits, against vocal opposition from King Władysław, causing a diplomatic rift between the Commonwealth and the Pope. John Casimir was made a cardinal, but in December 1646, finding himself unsuited to ecclesiastical life, he returned to Poland. In October 1647 he resigned as cardinal to stand in elections for the Polish throne. He attempted to gain the support of the Habsburgs and marry an Austrian princess to create an alliance between the nations in case of an unexpected attack, possibly from the east.
caption: A silver ewer from 1640 commissioned by John Casimir
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