Louis IX of Hesse-Darmstadt was the reigning Landgrave of Hesse-Darmstadt from 1768 to 1790.
Louis IX and his wife Countess Palatine Caroline of Zweibrücken became the most recent common ancestors of ... Wikipedia
Born: December 15, 1719, Darmstadt, Germany
Died: April 6, 1790 (age 70 years), Pirmasens, Germany
Grandchildren: Louis II, Grand Duke of Hesse, Frederick William III of Prussia, Princess Wilhelmine of Baden, and more
Great grandchildren: Louis III, Grand Duke of Hesse, William I, Prince Alexander of Hesse and by Rhine, and more