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Built in 1882 by the Marquis Armand de Pomereu d'Aligre, to be the "model farm" of Baronville, as well as the marquis' stables, this complex was subsequently constantly used for both agricultural and equestrian purposes. Used as the “Baronville Horse Riding Club” during the 1980s and 1990s, it was the setting for horse racing training and competitions welcoming personalities from the equestrian or artistic world, such as Jean Rochefort.

The church was built in the first half of the 11th century, on the ruins of a building that had suffered the horrors of the Norman invasions. The extensions of the nave and the ogival entrance door date from the reconstructions carried out after the Hundred Years War. The oriented Church built according to an elongated plan. A three-aisled nave ends with a semicircular apse. The nave is covered with a ribbed vault. The nave is flanked by a steeple with a long-sided roof and covered by a round hipped roof at the apse. The aisles are covered with a roof perpendicular to that of the main aisle, a characteristic of churches in the south of Yvelines. The bell tower is pierced with twin bays in a pointed arch with louvres. source: https://paroisse-ablis.fr/content/boinville-gaillard-eglise-assomption-de-tres-sainte-vierge

Failing to see the castle of the same name, the Carrousel gives you a good image of the architecture of the Castle.

today, the castle and its round towers display a singular silhouette in pink brick in the village. Its history dates back to the invasion of the Romans who set up a farm there to supply Rome with wheat. Over the years this farm was fortified then, during the wars of religion, it became a fortified castle surrounded by defensive moats. Raised to the rank of Marquisate by Louis XIV, the castle was abandoned. Very degraded, in 1760, the decision was taken to ask the architect Liégeon to rebuild, on the foundations, a simple residence, integrated into the outbuildings of the thirteenth century. During the revolution, the property was confiscated and then bought back from the National Property.