Timeline

Heritage classified

Key figures

Origin and history

The castle of Trégranteur, located in the Morbihan in Guégon, is built around 1750 by the architect Hippolyte de Brilhac for René-Jean Bonin, adviser to the parliament of Brittany. The latter, who had come from a family that had owned the premises since 1660, had a Louis XIV-style building erected, less common at that time, with a central body and two wings flanked by pavilions. The park and the ironwork gate, decorated with the Bonin and Saint-Pern weapons, are made by Eustache Roussin in the same years.

The seigneury of Trégranteur, attested from 1204, passed into the hands of several noble families by successive alliances: the Tregarantec (until 1544), the Quelen du Broutay, and the Bonin de Courroy from 1571. In the 15th century, it was the largest seigneury of Guégon. In 1740, René-Jean Bonin, after an advantageous marriage with a young lady of Saint-Pern, first entrusted the project to engineer André Forestier before opting for that of Hippolyte de Brilhac, priest and amateur of architecture.

After the French Revolution, the castle was renovated in the 19th century by the family of Halgouët: the moats were filled, outbuildings (including a dovecote) were demolished, and a farm was built. The entrance gate was classified as a historical monument in 1943, followed by the inscription of the castle and its park in 1947. Today, the estate belongs to a private company.

The architecture of the castle is distinguished by its three levels, its low arch windows with carved keys, and a double revolution porch leading to the main entrance. The ground floor, decorated in the Louis XV style, houses woodwork and paints in camaieu in the reception rooms. The park, originally designed in the 18th century, underwent major changes in the 19th century, altering its original appearance.

The ironware portal, attributed to Eustache Roussin, is a remarkable example of the local craftsmanship of the time. The latter, also author of the pulpit to preach by Josselin, incorporated the coat of arms of the Bonin and Saint-Pern families, symbolizing their union. The castle, although modified, retains architectural and decorative elements that bear witness to its Breton aristocratic history.

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