Louis IX, Landgrave of Hesse-Darmstadt

Louis IX
Louis IX
	Portrait of Louis IX around 1780 in the Musée historique de Strasbourg
Landgrave of Hesse-Darmstadt
Reign	12 October 1768 –; 6 April 1790
Predecessor	Louis VIII
Successor	Louis X
Born	15 December 1719; Darmstadt
Died	6 April 1790 (aged 70); Pirmasens
Spouses	; Countess Palatine Caroline of Zweibrücken (m. 1741; died 1774) ; Marie Adelaide of Cheirouze, Countess of Lemberg (m. 1775)
Issue	Caroline, Landgravine of Hesse-Homburg; Frederica Louisa, Queen of Prussia; Louis I, Grand Duke of Hesse; Amalie, Hereditary Princess of Baden; Wilhelmina Louisa, Tsarevna of Russia; Louisa Augusta, Grand Duchess of Saxe-Weimar-Eisenach; Prince Frederick; Prince Christian;
House	Hesse-Darmstadt
Father	Louis VIII, Landgrave of Hesse-Darmstadt
Mother	Countess Charlotte of Hanau-Lichtenberg

Louis IX of Hesse-Darmstadt (German: Ludwig) (15 December 1719 – 6 April 1790) was Landgrave of Hesse-Darmstadt from 1768 to 1790.