Kalmar Castle, located in Kalmar, Sweden, is a historic fortress with origins dating back to the 12th century. It has played a significant role in Swedish history, particularly during the Kalmar Union in the late 14th century when it served as the site for the signing of the union treaty between Sweden, Denmark, and Norway. The castle was extensively rebuilt in the Renaissance style during the reigns of King Gustav Vasa and his sons in the 16th century.
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