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Origin and history

The Château du Tiercent, located in the east of the church of Saint Martin in the town of Tiercent (Ille-et-Vilaine), is a castral complex composed of a medieval dungeon, ruins, a small house called the Chambre des Coëtlogon, and a large 17th century house. The dungeon, the last vestige of the castle rebuilt in the 15th century (called Old Halls), preserves mâchicoulis, a fireplace and narrow windows. The buildings, surrounded by an English-speaking park, reflect architectural changes from the 16th, 17th and 19th centuries, especially in the skylights, frontons and interior decorations.

The site could occupy an ancient site, evoked by some sources as a Roman castel, although the first definite mention dates back to the lords of the Tiercent, known since 1155. The latter retained the seigneury until the 17th century. In 1602, Gilles de Ruellan, a gun dealer who became a councillor of the state and near Richelieu, acquired the estate and built the great house after the building of the seigneury in barony (1608). His colossal heritage allowed him to build several castles in the Pays de Fougères, including that of the Tiercent, marked by Renaissance and classical elements.

The stables, built in the late 19th or early 20th century, complete the whole with re-uses of ancient stones, including seigneurial coats of arms. The farmhouse and agricultural dependencies (grange, supply) date back to the seventeenth century, with subsequent modifications. The castle, inscribed in the Historical Monuments in 1926, illustrates an architectural stratification from the Middle Ages to the modern era, linked to the history of the Breton noble families.

The interior of the large house, although redesigned, preserves decorations from the 17th and 19th centuries. The Chamber of Coëtlogon (XVI century) and the adjacent ruins, such as a dust window or a door in a basket handle, bear witness to the successive transformations. The cadastre of 1833 mentioned a building that had disappeared today, perpendicular to the dungeon, highlighting the evolution of the site. The high location, overlooking the road to Saint-Brice-en-Cogles, reinforces its historic strategic character.

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