Located next to the Vijverberg are several museums, like the Mauritshuis, the Gevangenpoort (Prison Gate), the Hague Historical Museum and the Gallery Prince William V.
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'Jantje' probably refers to John I, Count of Holland who died at the age of 15 years, and features in a well known Dutch children's song about The Hague.
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In this dunelake there was an island (not the current island in the Hofvijver) on which William II built his palace in 1248.