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Heritage classified

Key figures

Origin and history

The castle of Dinan, located in the Côtes-d'Armor, replaces a 11th century castral motte called "old chastel" or "Châteauganne", destroyed around 1170. Its presumed location, northeast of the city, is today marked by the residence of the sub-prefect, still called Château-Ganne. The tapestry of Bayeux (18-20 scenes) illustrates the capture of Dinan in 1064 by William of Normandy and Harold Godwinson, showing the surrender of Conan II of Brittany.

The ducal tower, built between 1380 and 1393 under John IV of Brittany, symbolizes its authority after the War of Succession. High 30 meters, it combines two round towers and a square forebody, crowned with mâchicoulis. Originally covered with slates, it lost its roof in the 17th century during transformations into a military prison, where English sailors were imprisoned in the 18th and 19th centuries.

In the 16th century, the Duke of Mercœur, head of the Catholic League, modernized the castle by linking the ducal tower to the Coëtquen tower (15th century) via a "subterranean Mercœur", and condemning the Gate of the Window. A high courtyard protected by spurs is added, with city-oriented burns, reflecting internal tensions. The castle became a prison and then a municipal museum in 1908, with ethnographic collections until 2015.

Ranked a Historic Monument in 1886, the castle is now a major tourist site, with more than 55,000 visitors in 2019. The recent restorations (2014–2019) allowed the opening of the Mercœur underground and a scenography focused on the princely life and art of war in the 15th century. The ensemble, including the Coëtquen Tower and the Gate of the Window, illustrates the architectural evolution of the Breton ducal residences.

The castle is open from April to December, offering thematic visits in summer. Its scenographic itinerary highlights its five original levels: kitchen, banquet room, chapel, withdrawal room and private apartments. These spaces reflect the strict organization of the aristocratic residences of the late 14th century, combining defensive functions and princely comfort.

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