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Waldeck (or later Waldeck-Pyrmont) was a sovereign principality in the German Empire and German Confederation and, until 1929, a constituent state of the Weimar Republic.
In 1655 its seat and the chief residence of its rulers shifted from the castle and small town of Waldeck, overlooking the Eder river and first mentioned in 1120, to Arolsen.
In January 1712 the count of Waldeck and Pyrmont was elevated to prince by Charles VI, Holy Roman Emperor.