Timeline

Heritage classified

Key figures

Origin and history

The château de la Groulais, also known as château de Blain, is a medieval fortress built in the early 12th century by Alain IV Fergent, Duke of Brittany. It was part of the Duchy's defensive system, alongside castles like Vitré or Fougères, to counter the threats of neighbouring principalities and kings of France. Originally destroyed in 1260 after a revolt, it was rebuilt and enlarged by Olivier II de Clisson, then transformed into a dreadful fortress under Olivier V de Clisson in the 14th century.

In the 15th century, the castle passed to the house of Rohan, which kept it until 1802. He suffered major damage during the Wars of Religion, especially in 1591, when he was burned by the troops of the Catholic League. In the 17th century Richelieu ordered its partial dismantling, eliminating its military role. After the Revolution, he changed hands several times, including those of Marie Bonaparte (1918-1950), who partially restored him.

Ranked a historic monument in 1977, the castle retains remarkable elements such as the Pont-Levis tower (XIVth century), the Connétable tower (1386), and the remains of the Logis du Roy. Its moat, once fed by l'Isac, and its enclosure walls testify to its strategic importance. Today, part of the estate is open to the public for historical exhibitions and reconstructions, while the other part remains private.

The site, with an area of 4.4 hectares, comprises nine partially preserved towers, a courtyard of honor transformed into parking, and gardens. Archaeological excavations revealed 16th century objects, including a treasure of 3,091 silver coins discovered in 1890. The castle illustrates the evolution of Breton military architecture, from medieval fortifications to Renaissance developments.

Among the figures related to the castle were Olivier V de Clisson, a connétable of France, and Catherine de Parthenay, a Calvinist who lived there with his children after the wars of Religion. The mathematician François Viète, tutor of Catherine de Parthenay, also stayed there. The estate, now shared between communal and private property, remains a symbol of Breton heritage.

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