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Heritage classified

Key figures

Origin and history

The château de Grignon, located in Winterval-Grignon in the Yvelines, is built in the seventeenth century under the impulse of Nicolas de Bellièvre, lord of Neauphle. Born from a medieval mansion acquired in 1582 by his father Pomponne de Bellièvre, Chancellor of France, the estate was transformed into a marquisat in 1651. In 1674, a land exchange with the church of Winterval allowed its expansion, to the detriment of part of the village moved westward. The castle, Louis XIII style with a brick and stone trimming, is surrounded by commons and farmland.

In 1682 the marquisat was sold to André Potier, a councillor in Parliament, marking the end of the Bellièvre era. After the Revolution, the estate passed into the hands of Marshal Ney by alliance, before being acquired in 1803 by the future Marshal Bessières. His widow sold him in 1826 to Charles X, who founded the Royal Agricultural Institution of Grignon, the first agricultural school in France. The establishment then moved on to Imperial School (1852), National School (1870), then Agricultural Institute (1971), before becoming AgroParisTech in 2007.

The castle, which has been listed as a historical monument since 1941, houses until 2022 research laboratories (INRAE, Terres Inovia) and student residences. His move to Saclay aroused tensions, especially in 2021 with a student blockade against his sale. In 2024, the domain remains a public good, temporarily welcoming migrants and considering an international campus project dedicated to agriculture and the environment. The 300-hectare park, enclosed by walls, combines agricultural land, wood and scientific buildings inherited from the 19th and 20th centuries.

U-style architecture, typical of the Louis XIII style, and historical commons contrast with modern facilities. The site, protected for its built and landscaped heritage, embodies both the 17th century seigneurial heritage and agronomic innovation. Recent controversies (aborted sale at PSG in 2016, furniture auction in 2022) highlight its heritage and memorial issue for the scientific and local community.

Since 2022, only the Terres Inovia laboratories remain on site. The castle, emptied of its educational functions, awaits a new project compatible with its status as a listed monument. The discussions focus on its future: a place for scientific mediation, a humanitarian reception area, or a site preserved for its historical and landscape value.

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