Louis IX, Landgrave of Hesse-Darmstadt
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Louis IX of Hesse-Darmstadt was the reigning Landgrave of Hesse-Darmstadt from 1768 to 1790.
Portrait of Louis IX around 1780 in the Musée historique de Strasbourg
Countess Palatine Caroline of Zweibrücken
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Caroline of the Palatinate-Zweibrücken was Landgravine of Hesse-Darmstadt by marriage to Louis IX, Landgrave of Hesse-Darmstadt. She was famed as one of the most learned women of her time and known as The Great Landgräfin.
Countess Palatine Caroline of Zweibrücken