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In page Charles IX of Sweden:

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His reign marked the start of the final chapter[citation needed] (dated 1648 by some) both of the Reformation and of the Counter-Reformation. With the death of his brother John III of Sweden in November 1592, the Swedish throne went to his nephew, the Habsburg ally Sigismund of Poland and Sweden. During these tense political times, Charles viewed the inheritance of the throne of Protestant Sweden by his devout Catholic nephew with alarm. Several years of religious controversy and discord followed.