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Key figures

Origin and history

The ramparts of Mont-Louis were designed by the military engineer Vauban in 1679 on the order of Louis XIV, in order to secure the newly annexed Roussillon after the Treaty of the Pyrenees (1659). The site, a natural promontory overlooking the Tet valley, offered an ideal defensive position between Cerdagne, Conflent and Capcir. Vauban applied his principles of saving the means: few works on the east side (protected by the river), and reinforced defences on the west towards Spain. The construction involved 3,700 soldiers, supervised by artisans, in harsh climatic conditions. The citadel, completed in 1681, could accommodate 2,500 men and 300 horses, becoming the highest fortress in France (1,600 m).

The city of Mont-Louis, created ex nihilo by Vauban, was organized into four zones (citadelle, high town, low city – never built – and dreaded). Its sober town planning included barracks, church, and strategic wells like the well of the Forçats, feeding the garrison with water. The citadel played a key role in the conflicts with Spain, notably in 1793-1794 under General Dagobert, who rejected the Spanish invasions during the Revolution. Renamed Mont-Libre in 1793, it regained its original name in 1803. In the 19th century, it served as a depot for the Spanish countryside, then as a prison and military hospital.

In the 20th century, Mont-Louis became a symbol of resistance: refuge during the Spanish war (1936), occupied by the Germans, and then liberated by the Free French Forces. In 1946, the citadel will house the 11th Shock Parachute Battalion (11th PCB), dissolved after the Algerian war and replaced in 1964 by the still active National Commando Training Centre (CNEC). At the same time, Mont-Louis was the pioneer of solar energy with the world's first solar furnace (1948), a precursor of that of Odeillo. Classified at UNESCO in 2008 as one of the fortifications of Vauban, the citadel remains an active military site and an intact testimony of 17th century defensive architecture.

The church of Saint-Louis (1733-1737), with clean lines typical of military engineers, and the well of the Forçats (with its unique squirrel cage wheel) illustrate the ingenuity of the Vaubani system. The solar furnace, still in operation, symbolizes the scientific innovation of the site. Today, Mont-Louis, with its 153 inhabitants (2023), combines historical heritage, elite military formation, and tourism linked to its architectural and energy heritage. His name pays tribute to Louis XIV, while his history reflects the French-Spanish border issues over more than three centuries.

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