Prince Frederick of Hesse-Kassel
| Landgrave Frederick | |
|---|---|
| Landgrave Frederick of Hesse-Kassel | |
 |
|
| Born |
11 September 1747 Kassel |
| Died | 20 May 1837 (aged 89) Rumpenheim Castle, Kassel |
| Spouse | Princess Caroline of Nassau-Usingen |
| Issue |
Prince William Prince Karl Friedrich Prince Friedrich Wilhelm Prince Ludwig Karl Prince Georg Karl Luise, Baroness George von der Decken 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 |
| Religion | Lutheranism |
Prince Frederick of Hesse-Kassel (11 September 1747 – 20 May 1837) 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 Queen Victoria (granddaughter of his first cousin King George III) 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 his marriage. The young prince Frederick, together with his two elder brothers, were with their mother the Landgravine Mary and became fostered by Protestant relatives in 1747. Soon the family moved to Denmark to be guests of her sister Louise of Great Britain, who died in 1751. His two elder brothers married Danish princesses - their first cousins - in 1763 and 1766 respectively. They remained in Denmark, becoming 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 became 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 to the present day.
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