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Origin and history

The Guildo Castle, located on a rocky spur overlooking the estuary of the Arguenon in Crehen (Côtes-d'Armor), is a 3,200 m2 courtyard castle built mainly in the 14th century. Joined the historical monuments in 1951, it has been part of the departmental council since 1981. Its strategic location, between micaschistes and dolerite, makes it a major defensive site, bordered by the river and steep cliffs. Archaeological excavations revealed six phases of development, including 12th century remains suggesting early noble occupation, marked by stone structures and equestrian objects.

The reconstruction of the castle in the 14th century followed its destruction during the War of Succession of Brittany (1341-1364). The new North House, with rooms on three levels, a kitchen and commons, reflects an architecture inspired by the French royal achievements. Polychrome wall paintings (false appliances, hake, florets) discovered in 2005 in a lower chamber attest to the refinement of the era. The central well and the wooden gallery on the façade complete this ensemble, revealing a high-ranking sponsor, probably linked to the Capetian Dukes of Brittany.

In the 15th century, the castle underwent major transformations under the impetus of Françoise de Dinan, wife of Gilles de Bretagne and then of Count Guy XIV de Laval. The commons are reorganized to accommodate stables and a marshalry, illustrating the importance of the horse in noble life. The Mad War (late 15th century) led to an urgent restoration of defence: dismantled roofs, wooden galleries pierced with poles, and cellars transformed into horse shelters. The violent destruction of the site in 1489, during the campaign of Louis II of the Tremoil, is confirmed by archaeological levels and traces of fire.

In the 16th century, only the eastern wing was rebuilt, while an artillery bastion was added at the end of the century to adapt to the wars of the League. This change reflects the evolution of military techniques, with ramparts in the lower halls and enhanced control of access to the Arguenon. The repeated fighting between 1590 and 1598 underlined its strategic role, before a gradual decline in the 17th–15th centuries: the site, strengthened and cultivated (maize as early as 1770), served even as a pigsty before being sold as a stone quarry in 1794.

Since 1982, excavations and restoration sites (led by the association Études et Chantiers Bretagne and then the Inrap) have revealed 75% of the area of the castle. This work, funded by the State and the Department until 2013, revealed unique painted decorations and developments related to daily life (forge, stables). The site, now in open access, offers a 3D reconstruction to visualize its peak in the 14th century. Research continues, providing rare insights into defensive wooden architecture and the history of Franco-Breton conflicts.

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