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Heritage classified

Key figures

Origin and history

Thiers-sur-Thève Castle, built around 1250-1260 by Thibault de Beaumont-Gâtinais and his wife Jeanne, is a rare example of a 13th century fortress where residential functions take precedence over military aspects. Its classic design, with a enclosure flanked by nine round towers, contrasts with its large hall with monumental windows, unique in Île-de-France. Destined to serve as a hunting relay for the bishops of Beauvais, he only fulfilled this role a generation before being partially ruined in 1358 during the Great Jacquerie.

Sold in 1276 to Renaud de Nanteuil, bishop of Beauvais, the castle houses in 1310-1311 eleven templiers awaiting trial. Destroyed during peasant revolts, it was abandoned in 1360 despite restoration projects, then dismantled in 1431 by royal order. Its stones later served to build local houses, while its ruins, classified in 1862, now house private houses. The site preserves remarkable remains, such as the ogival chapel tower or the arcades of the hall, despite destruction (e.g.: west gable shaved in 1870).

Architecturally, the castle is distinguished by its regular square plan (56.80 m side) and its towers with fine walls (2 m thick), a sign of rapid construction in two phases. The southeast tower, vaulted by dogives and adorned with carved capitals, is said to have housed the chapel, connected to the hall by a trilobed arch. The latter, pierced by large third-point bays, illustrates the luxury sought by the prelates, far from the military standards of the time. The courtines, partially rebuilt without authenticity, still surround a site marked by centuries of logging and farming.

The castle thus embodies a symbolic transition: conceived as a fortress, it quickly becomes a place of episcopal representation, before falling into disuse. Its early ranking (one of the first in France) underlines its heritage importance, despite the alterations suffered. Today, its ruins, mixed with modern dwellings, recall a brief but intense history, between ecclesiastical power and medieval social conflicts.

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