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Origin and history

The fortifications of Dun-sur-Auron, located in the Cher department in the Centre-Val de Loire region, date from the 4th quarter of the 12th century. This monumental defensive system, inscribed in historical monuments since December 20, 1988, consists of an oval and square enclosure, lined with ditches, as well as emblematic towers such as the large tower (ruined) and the towers of the Meusnerye, the Bergier and Colin. These structures, linked by courtesies, protected a castral mound and a Grand Court, testifying to a sophisticated military architecture for the time.

Originally, Dun-sur-Auron served as an advanced bastion of the Capetian royal estate as early as 1101, with a later strengthened first speaker. Between 1202 and 1203, Philippe Auguste had the fortifications completely overhauled: the addition of courtines, side towers and a dungeon, marking a major phase of modernization. The excavations of the 1950s (Buzançais mission) partially restored the original plan, revealing three successive enclosures (Châtelet, Châtel-Vieil, Châtel-Neuf) housing the majority of the medieval population.

The defensive assembly, partially destroyed (dunjon arased in 1847, courted reduced in the 18th century), retained key elements such as the roofs of sentinel posts and cutting stone appliances. The towers, transformed into prisons in the 16th century, illustrate the evolution of their use. Today, the protected remains (large tower, three enclosure towers, courtines) belong to the commune and recall Dun-sur-Auron's strategic role in defending the royal territory.

Dun's toponymy (attested under Duno in 1095 and Dunesi in the Carolingian era, 880) refers to the Gallo-Roman term Dunum, meaning "fortified enclosure". This linguistic past highlights the ancient defensive anchor of the site, long before Capetian developments. Archaeological and textual sources (such as Jacqueline Soyer's work on circular fortifications) confirm the regional importance of this military complex.

Architecturally, fortifications combine a variety of techniques: stone walls, stone trimmings, and conical roofs (like the dungeon, once covered with lead). The Hall-le-Roi (15th century), built on the site of a missing house, housed judicial services and a chapel, reflecting the military and administrative duality of the site. Investigations of the 1950s allowed the mapping of these historical superpositions.

Today, the site, a communal property, offers a tangible testimony of medieval defensive strategies in Berry. Its inclusion in the title of historical monuments and its local development (through programmes such as those of the DIREN Centre-Val de Loire) make it a key heritage to understand the urbanization and militarization of the territory under the Capetians.

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