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Origin and history

The Château de Rochefort-sur-Séran is an ancient castle whose remains, mainly dating from the 13th century, are located in the municipality of Cressin-Rochefort, in the department of Ain. Built on a mound one kilometre northeast of the village, it was the strategic center of the seigneury of Rochefort. Although its construction was estimated between the 11th and 12th centuries, the first reliable written records appeared much later, reflecting its progressive importance in the region.

In 1159 Gui de Rochefort, one of the first attested lords, gave up the castle and its lands to the episcopal see of Belley. This gesture marks the beginning of a long series of transmissions and conflicts related to its possession. In the 14th century, the castle was named in 1361, then passed in 1375 under the control of Pierre de Gerbais, treasurer of Savoy, before being confiscated in 1377 by Count Amédée VI. These hand changes illustrate the struggles of influence between noble families and Savoyard power.

In 1435, Duke Amédée VII of Savoie rewarded Antoine de Gerbais by granting him the castle and its outbuildings. However, for lack of male heirs, the seigneury returned to the Duke Louis de Savoie, who re-attributed it in 1446 to the sisters of Gerbais, Marguerite and Gasparde, married to the brothers Claude and Louis de Menthon. The Menthon family kept Rochefort for nearly two centuries, until the seigneury passed to the families of Mareste (from 1667) and Montillet de Grenaud (until 1792).

The castle, which became Barony under Prosper and Balthazar de Menthon in the 17th century, underwent transformations linked to its social status. After the Revolution, it fell into disuse before being partially restored between 1991 and 2003 through youth camps. This work preserved the remains of an emblematic monument of medieval military architecture and Savoyard feudal history.

Today, the ruins of the Château de Rochefort-sur-Séran reflect the political and social dynamics that shaped Bugey and the Auvergne-Rhône-Alpes region. Its history, marked by alliances, confiscations and complex inheritances, sheds light on the role of strong castles in territorial organization and seigneurial power in the Middle Ages.

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