William I, Elector of Hesse

William I
William I
Elector of Hesse
	Portrait by Wilhelm Böttner, c. 1795
Elector of Hesse
1st reign	15 May 1803 –; 28 August 1807
2nd reign	30 October 1813 –; 27 February 1821
Successor	William II
Landgrave of Hesse-Kassel; As William IX
Reign	31 October 1785 –; 15 May 1803
Predecessor	Frederick II
Born	3 June 1743; Kassel, Hesse-Kassel, Holy Roman Empire
Died	27 February 1821 (aged 77); Kassel, Hesse, German Confederation
Spouse	Princess Wilhelmina Caroline of Denmark (m. 1764; died 1820)
Issue; among others...	Marie Friederike, Duchess of Anhalt-Bernburg; Karoline Amelie, Duchess of Saxe-Gotha-Altenburg; Friedrich; William II, Elector of Hesse; Julius Jacob von Haynau (illegitimate);
House	Hesse
Father	Frederick II, Landgrave of Hesse-Kassel
Mother	Princess Mary of Great Britain
Religion	Calvinist

William I, Elector of Hesse (German: Wilhelm I., Kurfürst von Hessen; 3 June 1743 – 27 February 1821) was the eldest surviving son of Frederick II, Landgrave of Hesse-Kassel (or Hesse-Cassel) and Princess Mary of Great Britain, the daughter of George II.