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Heritage classified

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Origin and history

Suscinio Castle, first mentioned in 1218, was built by Pierre de Dreux, Duke of Brittany, as a hunting mansion on the edge of a forest. Between 1213 and 1237 it became a ducal residence, enlarged by John I with a north court and a quadrangular tower. This first castle, with a park and a Saint-Nicolas chapel, also served as a place of detention and storage of the Ducal treasury.

In the 14th century, under the Dukes John II, John IV and John V, Suscinio was transformed into a defensive fortress with drawbridge, watchtowers and mâchicoulis, while retaining his role as a recreational residence. The War of Succession of Brittany (1341–365) marked a phase of military reinforcement, although the castle did not play a central role in the fighting. The Montforts, a new ducal dynasty, added gardens and luxurious homes, reflecting their power.

From the 15th century, the castle lost its status as a principal residence for Nantes, but remained a strategic issue. Confiscated by the French crown in 1491, it was successively attributed to royal favourites such as Jean de Châlon or Diane de Poitiers. In the 16th century, artillery bastions were added to counter English and Spanish threats, while religious conflicts (Breton League) accelerated its decline.

Left behind after the Revolution, Suscinio was sold as a national good in 1798 and looted for its materials. Ranked a historic monument in 1840 thanks to Prosper Mérimée, it was bought in 1965 by the Morbihan department, which undertook a major restoration. Archaeological excavations (1975–2015) revealed medieval pavements, kitchens and remains of the chapel, providing new insight into its history.

Today, the castle, lined with moat and flanked by seven towers, illustrates the evolution of Breton military and residential architecture. Its restored houses, courtyards and bastions house exhibitions, while its 14th century alphabetical pavement, discovered in the chapel, remains one of its most enigmatic treasures. The fountain of the Duchess, once feeding the site, bears witness to its medieval engineering.

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