William IV1711 - 1751 Born Tue, 1 September 1711 Leeuwarden Died Fri, 22 October 1751 Huis ten Bosch, The Hague Buried Nieuwe Kerk, Delft Details Parents Prince of Orange Willem Karel Hendrik Friso Lived 40 years, 1 month, 21 days father John William Friso 1687 - 1711 mother Marie Louise of Hesse-Kassel 1688 - 1765 Siblings Sister Amalia of Nassau-Dietz 1710 - 1777