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Origin and history

The castle of Bonnemie, located on the island of Oléron in Charente-Maritime, is mentioned from the 11th century as a fief of the lords of Châtelaillon. The current towers, equipped with cannon-saws and archers, could date back to the 15th or 16th centuries, while the main house bodies were rebuilt in the 18th century. The estate belonged in particular to the family Le Berthon, Barons de Bonnemie, and underwent transformations in the 19th century that changed its appearance.

The architecture of the castle combines a square plan with a floor covered with hollow tiles, flanked by four towers (two squares and two circulars) covered with slate. An adjacent unit, with an additional floor, completes the whole, accompanied by large commons on the ground floor. Inside, there is a hall with a rotating staircase, a large paneled living room, a 17th century monumental fireplace, and a chapel in one of the towers. The woodwork of the 18th century, partially preserved, bears witness to successive developments.

The castle has been protected as historical monuments since 1981 for its facades and roofs, and in 1994 for its interiors. The seigneury, attested since the Middle Ages, illustrates the feudal history of the island, marked by local noble families such as the Berthon. The 19th and 20th century works preserved its hybrid character, between medieval fortress and classical seigneurial residence.

Today, the castle belongs to the commune of Saint-Pierre-d'Oléron. Its fenced park and outbuildings (loggia, easements, common wing) make it a coherent architectural ensemble, reflecting stylistic and functional evolutions over nearly nine centuries of history. The defensive elements (archères, écauguettes) recall its military origin, while the interior arrangements (lounges, chapels) emphasize its adaptation to residential life.

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