Biography
Friedrich III. von Hessen-Kassel und Rumpenheim was born 11 September 1747 to Friedrich II. von Hessen-Kassel (1720-1785) and Mary of Great Britain (1723-1772) and died 20 May 1837 of unspecified causes. He married Caroline Polyxene von Nassau-Usingen (1762-1823) 2 December 1786 .
Children
| Name | Birth | Death | Joined with |
| Wilhelm X. von Hessen-Kassel-Rumpenheim (1787-1867) | 24 December 1787 Biebrich, Hesse, Germany | 5 September 1867 Copenhagen, Denmark | Louise Charlotte of Denmark (1789-1864) |
| Karl Friedrich von Hessen-Kassel-Rumpenheim (1789-1802) | |||
| Friedrich Wilhelm von Hessen-Kassel-Rumpenheim (1790-1876) | |||
| Ludwig Karl von Hessen-Kassel-Rumpenheim (1791-1800) | |||
| Georg Karl von Hessen-Kassel-Rumpenheim (1793-1881) | |||
| Luise von Hessen-Kassel-Rumpenheim (1794-1881) | |||
| Marie Wilhelmine Friederike von Hessen-Kassel-Rumpenheim (1796-1880) | 21 January 1796 Hanau Castle | 30 December 1880 Neustrelitz | Georg von Mecklenburg-Strelitz (1779-1860) |
| Auguste von Hessen-Kassel (1797-1889) | 25 July 1797 | 6 April 1889 | Adolphus, Duke of Cambridge (1774-1850) |