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Heritage classified

Key figures

Origin and history

The ramparts of Dinan, erected from the 13th century by the local lords and then the Dukes of Brittany, protect a strategic city built in the 11th century on a plateau overlooking the Rance. Operator of steep valleys in the east and west, the 2 650 m (30 ha) enclosure follows an irregular quadrilateral, reinforced by ditches and towers. In the 15th century, under Peter II and Francis II, five towers of iron-to-horse artillery (Coëtquen, Penthièvre) modernized the defences facing the black powder, while the doors (Saint-Malo, Jerzual) are equipped with advanced boulevards.

The construction begins after the acquisition of Dinan by Jean I le Roux (1265), with major works in the 14th century (donjon, towers, doors). The War of Succession of Brittany (1341–1379) accelerated the fortifications, followed by a wave of renovations under Francis II (1476–88), marking the military climax of the site. The conflicts with France (Ligue du Bien publique, 1465–1468) led to the construction of counterscarps and the expansion of moats, making Dinan the 3rd stronghold of Brittany after Rennes and Nantes.

In the 16th century, the Duke of Mercœur, leader of the Leagues, strengthened the ramparts by walling doors (Jerzual, Guichet) and adding triangular bastions, such as the spur in front of the Saint-Julien tower. The Saint-Louis Gate (1620), pierced by Royal Engineer Thomas Poussin, facilitates access to Rennes, while underground galleries (such as the "Mercoeur Underground") connect the works. These late adjustments respond to logistical needs and headquarters progress.

As early as the 17th century, Dinan lost its strategic role and its ramparts became a prison, neglected despite ad hoc repairs (inspection of 1693). The French Revolution saw a temporary restoration in the face of vendean threats, but the 19th century led to destruction (comblement of ditches, demolition of the hotel door in 1880). Preservation, however, began with the classification at the Historical Monuments (1886), saving one of the largest fortified ensembles in France, now open to the public.

The oldest remains (late 13th-14th centuries) include courtines, the Saint-Malo Gate, and the Beaufort Tower. The 15th century marked a turning point with artillery towers (Saint-Julien, Lesquen) before 1476, then imposing platforms (Coëtquen, Connétable) incorporating casemates. The works of 1476–88, supervised by John II of Coëtquen (Captain of Dinan), prepare the city for the Franco-Breton war. The last modifications (Porte Saint-Louis, bastions) date from the 16th-17th centuries, before partial demolitions of the 18th-18th centuries.

Today, the walls of Dinan, a communal property, illustrate the evolution of defensive techniques from the Middle Ages to the Renaissance. Their exceptional state of conservation — unique in Brittany after the disappearance of the enclosures of Rennes and Nantes — makes it a major site for the study of military architecture. The Fête des Remparts, created in 1982, celebrates this medieval heritage every two years, attracting thousands of visitors.

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