Prince Frederick of Hesse-Kassel

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Landgrave Frederick
Landgrave Frederick of Hesse-Cassel
Frederick, prince of Hesse-Kassel, painted by Wilhelm Böttner, 1787.jpg
Spouse Princess Caroline of Nassau-Usingen
Landgrave William of Hesse-Kassel
Karl Friedrich
Friedrich Wilhelm
Ludwig Karl
Georg Karl
Luise Karoline Marie Friederike
Marie, Grand Duchess of Mecklenburg-Strelitz
Princess Augusta, Duchess of Cambridge
House House of Hesse-Cassel
Father Frederick II, Landgrave of Hesse-Cassel
Mother Princess Mary of Great Britain
Born (1747-09-11)11 September 1747
Died 20 May 1837(1837-05-20) (aged 89)
Rumpenheim Castle, Kassel
Religion Lutheranism

Landgrave Frederick III of Hesse-Kassel (11 September 1747 – 20 May 1837), born Prince Frederick of Hesse, was a younger member of the dynasty that ruled the Landgraviate of Hesse-Kassel (or Hesse-Cassel) and a Danish general.

He was born as the youngest son of Hereditary Prince Frederick of Hesse-Kassel (the future Landgrave Frederick II) and Princess Mary of Great Britain. He was the last surviving grandchild of George II of Great Britain, dying one month before his first cousin twice removed, Victoria ascended to the throne.


His father, the then hereditary prince (who reigned from 1760 and died in 1785) had in 1747 left the family and soon converted Catholicism, and in 1755 formally ended the marriage. The young prince Frederick, together with his two elder brothers, were with their mother the landgravine Mary and became since 1747 fostered by Protestant relatives and soon moved to Denmark, to be guests of her sister Louise of Great Britain who however died in 1751. His two elder brothers married Danish princesses, their first cousins, in 1763 and 1766 respectively. They remained in Denmark, becoming its important lords and royal functionaries. Only his eldest brother returned to Kassel, in 1785 when ascending the landgraviate.


He married Princess Caroline of Nassau-Usingen (4 April 1762 Biebrich - 17 August 1823 Offenbach), a remarkable heiress of a family which went extinct in male line. 1781 he bought the castle of Rumpenheim, Offenbach, from his brother Carl, and it became the family's seat. His descendants are known as the Hesse-Kassel-Rumpenheim branch of the House of Hesse, one of only two branches that survived until present.