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In page Charles IX of Sweden:

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While King Sigismund resided in Poland, Charles and the Swedish privy council ruled in Sigismund's name. After various preliminaries, the Riksdag of the Estates forced Sigismund to abdicate the throne to Charles IX in 1595.[citation needed] This eventually kicked off nearly seven decades of sporadic warfare as the two lines of the divided House of Vasa both continued to attempt to remake the union between the Polish and Swedish thrones with opposing counter-claims and dynastic wars.