William I, Elector of Hesse

William I
Elector of Hesse
Portrait by Wilhelm Böttner, c. 1795
Landgrave of Hesse-Kassel
Reign31 October 1785 –
27 February 1821
PredecessorFrederick II
SuccessorWilliam II
Born(1743-06-03)3 June 1743
Kassel, Hesse-Kassel, Holy Roman Empire
Died27 February 1821(1821-02-27) (aged 77)
Kassel, Hesse, German Confederation
Spouse
(m. 1764; died 1820)
Issue
among others...
HouseHesse
FatherFrederick II, Landgrave of Hesse-Kassel
MotherPrincess Mary of Great Britain
ReligionCalvinist

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.