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Origin and history

The citadel of Château-d'Oléron is a military structure built between 1630 and 1704 to protect the island and the Atlantic coast. Commanded by Cardinal de Richelieu in 1630, it replaced a medieval castle in ruins and was modernized by Vauban from 1685. It became a strategic place for training soldiers leaving for New France, such as those from Acadia or Louisiana between 1710 and 1718. Transformed into a prison during the Terror and in 1870, it was classified as a historical monument in 1929.

The site was already fortified in the 11th century, with a castle belonging to the Dukes of Aquitaine, where Alienor of Aquitaine published the roles of Oleron, one of the first maritime codes. During the Wars of Religion, the castle was contested between Catholics and Protestants: in 1586, the troops of Agrippa d'Aubigné took over before being repulsed by the governor of Brouage. In the 17th century, Richelieu ordered its reconstruction in bastioned form, entrusted to the engineer Pierre d'Argencourt, then modernized by Vauban with horned works and a new city organized in checker.

The work, carried out between 1688 and 1704, involved up to 7,000 workers, including requisitioned peasants and local sauniers. Despite extreme conditions (cold, exhaustion), the citadel extends with bastions, a counterguard and covered paths. It houses a permanent garrison and a harbour dug in 1740 to facilitate departures to Canada. Damaged during the 1945 bombings, it was restored from 1959 and now houses a cultural arsenal, exhibitions and a path marked by historical sculptures.

Architecturally, the citadel blends elements from the 17th and 18th centuries: the Royal Gate (circa 1640) with the weapons of Richelieu, the arsenal (stores and chapel), and bastions like that of the Brèche, dedicated to the soldiers of New France. The fortifications, inspired by Vauban, include stone walls, vaulted casemates and a stone powderbox. The fortified city, surrounded by ramparts, complemented the defensive system with strongholds and scalables.

Ranked a historic monument in 1929 (with partial decommissionings in 1935), the citadel illustrates the evolution of French military techniques, from Richelieu to Vauban. Its role in colonial history (boarding for Canada) and its transformations (prison, barracks, tourist site) make it a symbol of New Aquitaine's maritime and military heritage.

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