Château de Montplaisant, Medieval castle in Saint-Hilaire-de-Brens, France.

Château de Montplaisant is a fortified stronghold featuring an elongated keep and thick stone walls with slate-covered roofs typical of medieval military architecture. The complex comprises a rectangular layout with an inner courtyard and defensive access points.

Built from 1280 by the Loras family on the ruins of an older castel, of which some rampart elements remain, the stronghold had a 30-metre-square plan with a keep, walls, moat and drawbridge. Its austere defensive architecture responded to the wars between the Dauphiné and Savoy. The Loras held it as a fief for 700 years, and after being an abandoned state property the main dwelling has been under renovation for several years.

The Loras family, among the oldest noble houses of the Dauphiné region, shaped this stronghold over centuries through their occupation and stewardship. Their presence remains visible in how the building reflects their long connection to the site.

From Bourgoin-Jallieu take the RD 208, then the RD 522 and finally the RD 65 towards Crémieu; the castle overlooks the village and is reached by the RD 65f. The nearest station is Bourgoin-Jallieu. The castle is regularly open to visitors in summer and on heritage days.

A fireplace within the interior bears subtle marks suggesting past connections to the Templar Order and later the Order of Malta. These discrete details are easy to miss but reveal unexpected religious and military ties embedded in the building.