William IV of Orange-Nassau
| William IV | |
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Portrait of William IV (1751), attributed to Johann Valentin Tischbein
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| Stadtholder of the United Provinces | |
| Reign | 4 May 1747 – 22 October 1751 |
| Predecessor | William III |
| Successor | William V |
| Prince of Orange | |
| Reign | 1 September 1711 – 22 October 1751 |
| Predecessor | John William Friso |
| Successor | William V |
| Born | 1 September 1711 Leeuwarden, Dutch Republic |
| Died | 22 October 1751 (aged 40) Huis ten Bosch, The Hague, Dutch Republic |
| Burial | 4 February 1752 Nieuwe Kerk, Delft |
| Spouse | Anne, Princess Royal |
| Issue Details... |
Carolina, Princess of Nassau-Weilburg Princess Anna of Orange-Nassau William V, Prince of Orange |
| House | Orange-Nassau |
| Father | John William Friso, Prince of Orange |
| Mother | Landgravine Marie Louise of Hesse-Kassel |
William IV, Prince of Orange-Nassau (Willem Karel Hendrik Friso; 1 September 1711 – 22 October 1751) was the first hereditary Stadtholder of all the United Provinces.
William was born in Leeuwarden, Netherlands, the son of John William Friso, Prince of Orange, head of the Frisian branch of the House of Orange-Nassau, and of his wife Landgravine Marie Louise of Hesse-Kassel (or Hesse-Cassel). He was born six weeks after the death of his father.
William succeeded his father as Stadtholder of Friesland and also, under the regency of his mother until 1731, as Stadtholder of Groningen. In 1722 he was elected Stadtholder of Guelders. The four other provinces of the Dutch Republic:, Holland, Zeeland, Utrecht and Overijssel had in 1702 decided not to appoint a stadtholder after the death of stadtholder William III, issuing the history of the Republic into a period that is known as the Second Stadtholderless Period. In 1747 those four provinces also accepted William as their stadtholder.
In 1720 William was named the 549th Knight of the Order of the Garter. On 25 March 1734 he married at St. James' Palace Anne, Princess Royal, eldest daughter of King George II of Great Britain and Caroline of Ansbach. William and Anne had five children:
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