Guillaume II des Pays-Bas
Prince William Alexander Frederick "Ernest Casimir" of the Netherlands, Prince of Orange-Nassau (Dutch: "Willem Alexander Frederik Ernst Casimir, Prins der Nederlanden, Prins van Oranje-Nassau"; Soestdijk Palace, 21 May 1822 – Brussels, 22 October 1822) was the fourth son of the Prince of Orange, later King William II of the Netherlands and his wife Grand Duchess Anna Pavlovna of Russia.