Polish–Swedish Union
The Polish–Swedish union was a short-lived personal union between the Polish–Lithuanian Commonwealth and the Kingdom of Sweden between 1592 and 1599. It began when Sigismund III Vasa, elected King of Poland and Grand Duke of Lithuania, was crowned King of Sweden following the death of his father John III. The union ended following a civil war in Sweden in which he lost the crown to his uncle, who eventually became Charles IX. Sigismund afterwards returned to Warsaw and pursued a war against his former realm. History Prelude After the death of John III, his son Sigismund became heir to the throne of Sweden. Sigismund at that time was already the elected King of Poland (since 1587). Sigismund certainly valued the Swedish throne and upon learning about the death of his father, and the pretensions to the throne of his uncle, Duke Charles of Södermanland, he asked the Sejm (Polish parliament) for permission to leave the Commonwealth and go to Sweden, where he could s ...
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