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Origin and history

Lehon Castle, mentioned in 1034, was initially a wooden fortress twice destroyed in the 11th century (1034 by the Duke of Brittany, 1065 by the Duke of Normandy). Reconstructed in stone in the 12th century (1124, 1170), it became a strategic issue during the conflicts between Breton lords and kings of England, like Henry II Plantagenet, who razed it in 1169 before its reconstruction.

The current building dates from the 13th century, built by Pierre Mauclerc (Pierre I of Brittany) after his purchase in 1264 from Alain II of Avaugour. From a trapezoidal plane inspired by philippian norms, it included a central dungeon (now extinct), semicircular corner towers and intermediate horse iron towers. The War of the Succession of Brittany (1341-1364) severely damaged its foundations, requiring a retreat from the walls in the 14th century.

In the 15th century, the castle was gradually abandoned in favour of the fortress of Dinan. Serving as a stone quarry from the 17th century, its ruins were ceded in 1644 to the monks of the Abbey of Léhon, then sold as national property in 1791. In the 19th century, a Saint Joseph chapel was erected there (1873) before being destroyed in 1963. The remains, restored in 1999, have been listed as historical monuments since 2004.

Architecturally, the site combines medieval defensive elements (archères, barbacane of the 14th century) and adaptations for artillery (masonry stalls, 15th century false braces). The northwest tower, originally from the 13th century, was remodeled into horse iron after the destruction of the Hundred Years' War. The stones of the successive dungeons were used again to build the cloister of the nearby abbey.

The excavations and ancient documents reveal a continuous occupation despite the destructions: the castle was in turn seigneurial residence (family of Dinan, Avaugour), prison, and symbol of Ducal power under John I of Brittany. Its decline accelerated with the rise of Dinan, which became a regional stronghold. Today, the ruins offer a rare testimony of military evolutions between the Middle Ages and Renaissance.

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