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From 1815 to 1852

For most of the 19th century, from Napoleon 's time to the Second Empire, the Louvre and other national museums were managed under the monarch's civil list and thus depended much on the ruler's personal involvement. Whereas the most iconic collection remained that of paintings in the Grande Galerie, a number of other initiatives mushroomed in the vast building, named as if they were separate museums even though they were generally managed under the same administrative umbrella. Correspondingly, the museum complex was often referred to in the plural (" les musées du Louvre ") rather than singular.

During the Bourbon Restoration (1814–1830), Louis XVIII and Charles X added to the collections. The Greek and Roman sculpture gallery on the ground floor of the southwestern side of the Cour Carrée was completed on designs by Percier and Fontaine. In 1819 an exhibition of manufactured products was opened in the first floor of the Cour Carrée's southern wing and would stay there until the mid-1820s. Charles X in 1826 created the Musée Égyptien and in 1827 included it in his broader Musée Charles X, a new section of the museum complex located in a suite of lavishly decorated rooms on the first floor of the South Wing of the Cour Carrée. The Egyptian collection, initially curated by Jean-François Champollion, formed the basis for what is now the Louvre's Department of Egyptian Antiquities. It was formed from the purchased collections of Edmé-Antoine Durand, Henry Salt and the second collection of Bernardino Drovetti (the first one having been purchased by Victor Emmanuel I of Sardinia to form the core of the present Museo Egizio in Turin). The Restoration period also saw the opening in 1824 of the Galerie d'Angoulême, a section of largely French sculptures on the ground floor of the Northwestern side of the Cour Carrée, many of whose artefacts came from the Palace of Versailles and from Alexandre Lenoir's Musée des Monuments Français following its closure in 1816. Meanwhile, the French Navy created an exhibition of ship models in the Louvre in December 1827, initially named musée dauphin in honor of Dauphin Louis Antoine, building on an 18th-century initiative of Henri-Louis Duhamel du Monceau. This collection, renamed musée naval in 1833 and later to develop into the Musée national de la Marine, was initially located on the first floor of the Cour Carrée's North Wing, and in 1838 moved up one level to the 2nd-floor attic, where it remained for more than a century.

Following the July Revolution, King Louis Philippe focused his interest on the repurposing of the Palace of Versailles into a Museum of French History conceived as a project of national reconciliation, and the Louvre was kept in comparative neglect. Louis-Philippe did, however, sponsor the creation of the musée assyrien to host the monumental Assyrian sculpture works brought to Paris by Paul-Émile Botta, in the ground-floor gallery north of the eastern entrance of the Cour Carrée. The Assyrian Museum opened on 1 May 1847. Separately, Louis-Philippe had his Spanish gallery displayed in the Louvre from 7 January 1838, in five rooms on the first floor of the Cour Carrée's East (Colonnade) Wing, but the collection remained his personal property. As a consequence, the works were removed after Louis-Philippe was deposed in 1848, and were eventually auctioned away in 1853.

The short-lived Second Republic had more ambitions for the Louvre. It initiated repair work, the completion of the Galerie d'Apollon and of the salle des sept-cheminées, and the overhaul of the Salon Carré (former site of the iconic yearly Salon) and of the Grande Galerie. In 1848, the Naval Museum in the Cour Carrée's attic was brought under the common Louvre Museum management, a change which was again reversed in 1920. In 1850 under the leadership of curator Adrien de Longpérier, the musée mexicain opened within the Louvre as the first European museum dedicated to pre-Columbian art.