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Origin and history

Neuville-sur-Oise Castle, located in Val-d'Oise in Île-de-France, embodies seven centuries of local and regional history. It has been a historical monument since 1952 and is distinguished by an exceptional archive, covering far beyond local life, with significant links to the Old Regime and to influential aristocratic families. Its current architecture, with two wings and a central body, dates back to a reconstruction carried out between 1640 and 1654 under Charles de la Grange, Baron de Conflans, ancestor of Anne de La Grange-Trianon.

The seigneury of Neuville passes into the hands of several noble families, including the Deliès de Pontoise, descendants of the Valois, then the Barons of Conflans. In 1775, the estate was sold to Florimond, Count Mercy of Argenteau, Ambassador of Austria to France under Louis XV and Louis XVI, in charge of monitoring Marie-Antoinette. During the Revolution, the castle was acquired by a merchant, Picquefeu, who destroyed feudal archives to erase traces of the seigneurial past. The property changed hands again in 1822, when the Cornudet family of the Chomettes, which had emerged from the Empire and was linked to prestigious lines, undertook important work there.

In the 20th century, Bertrand de La Poëze d Gradually expropriated, he finally gave up the castle in 1989 to Cergy-Pontoise's public establishment, which left it to abandon until it was transformed into a retirement centre in 2001. The archives of the estate, distributed among the departmental archives of Val-d'Oise and private collections, offer a rare dive into the aristocratic and institutional life since the seventeenth century.

Before it was sold, the castle was dismantled, and part of its furniture was transferred to Austria, to the imperial castle of Artstetten. The 220 dossiers of archives conserved trace the history of the seigneury, the estate and the families that follow it, forming a unique documentary heritage. Today, the castle, although protected, bears the stigma of decades of neglect, while remaining a symbol of the seigneurial past and modern transformations of the region.

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