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| Louis IX | |
|---|---|
 Portrait of Louis IX, 18th century | |
| Landgrave of Hesse-Darmstadt | |
| Reign | 12 October 1768 – 6 April 1790 |
| Predecessor | Louis VIII |
| Successor | Louis X |
| Born | (1719-12-15)15 December 1719 Darmstadt |
| Died | 6 April 1790(1790-04-06) (aged 70) Pirmasens |
| Spouses | |
| Issue | |
| 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) wasLandgrave of Hesse-Darmstadt from 1768 to 1790.
After his military service in the army ofFrederick the Great, Louis was involved in freemasonry and interested theosophy and alchemy. He corresponded withEmanuel Swedenborg in 1771, as Swedonborg hoped that Louis would take over leadership ofSwedish Rite freemasonry in Germany.[1]
As of 2025, Louis, along with his wifeCaroline, are the most recent common ancestors of all currently reigning hereditary monarchs in Europe.
Louis IX was born inDarmstadt on 15 December 1719 toLouis VIII, Landgrave of Hesse-Darmstadt, andCharlotte of Hanau-Lichtenberg and Müntzenberg.
His main residence was his palace in Pirmasens,Schloss Pirmasens.
On 12 August 1741, Louis marriedCaroline, daughter ofChristian III, Duke of Zweibrücken. They had three sons and five daughters, including:
In 1775, Louis IX married Marie Adelaide of Cheirouze, countess of Lemberg. On 6 April 1790, Louis died inPirmasens.
Additionally Louis had an extramarital son with Ernestine Rosine Doll:
| Ancestors of Louis IX, Landgrave of Hesse-Darmstadt[2] |
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Media related toLouis IX, Landgrave of Hesse-Darmstadt at Wikimedia CommonsLouis IX, Landgrave of Hesse-Darmstadt Cadet branch of theHouse of Hesse Born: 15 December 1719 Died: 6 April 1790 | ||
| Regnal titles | ||
|---|---|---|
| Preceded by | Landgrave of Hesse-Darmstadt 1768–1790 | Succeeded byas Grand Duke of Hesse and by Rhine |
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| People | |
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