William II of the Netherlands
It was presented to William II of the Netherlands in 1815 in recognition of his services at the Battle of Waterloo. From 1816 to 1821, the palace was significantly expanded by adding two wings, the northern or Baarn wing, and the southern or Soest wing. In 1842 its contents were enriched by the addition of the neoclassical furnishings of his former palace in Brussels, today the Palais des Académies.