It was in the King’s Tower in 1317 that the infamous Nyköping Banquet took place: one of King Magnus’s three sons, Birger, invited his brothers Erik and Valdemar to celebrate Christmas at Nyköping and provided a grand banquet. Once the meal was complete, and the visiting brothers had retired to bed, Birger had them thrown in the castle’s dungeon, threw the key into the river and left them to starve to death. In the nineteenth century, a key was caught by a boy fishing in the river; whether the rusting item he found, now on display in the museum, really is the one last touched by Birger, no one knows.

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