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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 medieval fortress combining defensive functions and residential comfort. Built on a square plan of 56.80 m side, flanked by nine round towers, it stands out for its large hall with Gothic windows, unique in Île-de-France. This hunting relay of the bishops of Beauvais, sold in 1276 to Renaud de Nanteuil, illustrates the evolution of the castles towards spaces of representation rather than purely military.

The life of the castle was brief: partially ruined during the Great Jacquerie in 1358, it was dismantled in 1431 on royal order, its walls lowered to 3 meters. In the 17th century, his land passed to the constable Anne de Montmorency, then to forest operators. Ranked a historic monument in 1862, its remains now house houses, despite degradations such as the destruction of the West Gable in 1870. Its architecture, marked by ogival vaults and carved capitals, bears witness to a period of peace in the thirteenth century, where luxury prevailed over defence.

The palace's jewel building, the building, was 25 metres long and had a south façade, with large openworked tympanum windows typical of the radiant Gothic. Inside, third-point arcades and stained glass windows (disappeared) highlighted its sumptuous character. The southeast tower, probably chapel, housed a vaulted octagonal room, connected to the large room by a trilobed arch. These elements, coupled with the absence of aggressive defensive devices (such as a drawbridge), confirm its residential and symbolic vocation.

The site, surrounded by moat fed by the Thève, was strategically isolated in marshy terrain, far from the major axes. Its early decline is due to the damage suffered during peasant revolts and the economic choices of bishops, preferring to abandon its restoration. The ruins, occupied by a farm for centuries, nevertheless retain remarkable architectural details, such as the double latrines near the southwest tower or the carved culs-de-lampe of the chapel.

Among the notable episodes, the castle served briefly as a prison for eleven templars between 1310 and 1311, before their trial. This punctual use contrasts with its main role as episcopal residence, where hunting, reception and seigneurial management were mixed. The dismantling of 1431, with the arching of towers, marked its transformation into a simple enclosure, before its stones were used again to build houses in the seventeenth century.

Today, the classified remains offer a rare testimony of 13th century seigneurial architecture in Picardia. Their fragmentary state, between medieval ruins and modern reconstructions, reflects a turbulent history, where military imperatives quickly gave way to the demands of comfort and prestige, before forgetfulness settled for centuries.

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