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Louis I
Grand Duke of Hesse and by Rhine
Reign14 August 1806 – 6 April 1830
SuccessorLouis II
Landgrave of Hesse-Darmstadt
Reign6 April 1790 – 14 August 1806
PredecessorLouis IX
Born(1753-06-14)14 June 1753
Prenzlau, Brandenburg
Died6 April 1830(1830-04-06) (aged 76)
Darmstadt, Hesse
SpousePrincess Louise of Hesse-Darmstadt
IssueGrand Duke Louis II
Princess Louise
Prince George
Prince Frederick
Prince Emil
Prince Gustav
FatherLouis IX, Landgrave of Hesse-Darmstadt
MotherCountess Palatine Caroline of Zweibrücken

Louis I, Grand Duke of Hesse (14 June 1753 in Prenzlau – 6 April 1830 in Darmstadt) was Landgrave of Hesse-Darmstadt (as Louis X) and later the first Grand Duke of Hesse and by Rhine.


Kronenthaler of Louis, Grand Duke of Hesse and by Rhine, 1825.

Louis was the son of Louis IX, Landgrave of Hesse-Darmstadt, and succeeded his father in 1790. He presided over a significant increase in territory for Hesse-Darmstadt during the imperial reorganizations of 1801-1803, most notably the Duchy of Westphalia, hitherto subject to the Archbishop of Cologne. Allied to Napoleon, Louis in 1806 was elevated to the title of a Grand Duke of Hesse and joined the Confederation of the Rhine, leading to the dissolution of the Empire. At the Congress of Vienna in 1814/15, Louis had to give up his Westphalian territories, but was compensated with the district of Rheinhessen, with his capital Mainz on the left bank of the Rhine. Because of this addition, he amended his title to Grand Duke of Hesse and by Rhine.

In 1844, a 33-meter column called Langer Ludwig (meaning Long Louis), was set up In his commemoration in the middle of the Luisenplatz, the largest square of Darmstadt.

Marriage and family

In 1776, he became engaged to Sophie Dorothea of Württemberg, eldest daughter of Frederick II Eugene, Duke of Württemberg. The engagement was broken off so that Sophia Dorothea could marry Louis's recently widowed brother-in-law Tsarevich Paul Petrovich, son and heir of Catherine II "the Great", Empress of Russia. He received a monetary compensation when the engagement was broken.

On 19 February 1777, Louis married his first cousin, Princess Louise of Hesse-Darmstadt ( 15 February 1761 – 24 October 1829), a daughter of Prince George William of Hesse-Darmstadt. Together, they had eight children:



  1. ^ Genealogie ascendante jusqu'au quatrieme degre inclusivement de tous les Rois et Princes de maisons souveraines de l'Europe actuellement vivans [Genealogy up to the fourth degree inclusive of all the Kings and Princes of sovereign houses of Europe currently living] (in French). Bourdeaux: Frederic Guillaume Birnstiel. 1768. p. 69.
Louis I, Grand Duke of Hesse
Cadet branch of the House of Hesse
Born: 14 June 1753 Died: 6 April 1830
Regnal titles
Preceded by
Louis IX
Landgrave of Hesse-Darmstadt
Title abolished
New title Grand Duke of Hesse and by Rhine
Succeeded by
Louis II