Louis IX of Hesse-Darmstadt (German: Ludwig) (December 15, 1719 – May 13, 1790) was the Landgrave of Hesse-Darmstadt from 1768 - 1790. He was a son of Louis VIII, Landgrave of Hesse-Darmstadt, and Charlotte of Hanau-Lichtenberg and Müntzenberg. He was born in Darmstadt on 15 December, 1719. On 12 August, 1741, Louis married Karoline, daughter of Christian III, Duke of Zweibrücken. They had five sons and three daughters, including:
- Caroline (1746-1821), married Friedrich V, Landgrave of Hesse-Homburg
- Frederica Louisa (1751-1805), married King Friedrich Wilhelm II of Prussia and became Queen of Prussia
- Louis X (1753-1820), later Grand Duke Louis I
- Amalie (1754-1832), married Karl Ludwig, Hereditary Prince of Baden
- Wilhelmina Louisa (1755-1776), married Grand Duke Pavel Petrovich of Russia, later emperor
- Louisa Augusta (1757-1830), married Karl August, Grand Duke of Saxe-Weimar-Eisenach
- Frederick (1759-1802)
- Christian (1763-1830)
Ancestry
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Louis VI, Landgrave of Hesse-Darmstadt | ||||||||||||
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Ernest Louis, Landgrave of Hesse-Darmstadt |
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Elisabeth Dorothea of Saxe-Coburg | ||||||||||||
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Louis VIII, Landgrave of Hesse-Darmstadt |
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Albrecht V, Margrave of Brandenburg-Ansbach | ||||||||||||
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Dorothea Charlotte of Brandenburg-Ansbach |
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Sofie Margarete of Oettingen | ||||||||||||
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Louis IX, Landgrave of Hesse-Darmstadt |
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Johann Reinhard II, Count of Hanau | ||||||||||||
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Johann Reinhard III of Hanau-Lichtenberg |
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Countess Palatine Anna Magdalena of Zweibrucken-Bischweiler | ||||||||||||
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Charlotte Christine of Hanau-Lichtenberg |
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Johann Friedrich, Margrave of Brandenburg-Ansbach | ||||||||||||
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Margravine Dorothea Friederike of Brandenburg-Ansbach |
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Margravine Johanna Elisabeth of Baden-Durlach | ||||||||||||
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| Preceded by Louis VIII |
Landgrave of Hesse-Darmstadt 1768–1790 |
Succeeded by Louis X |
