Castle of Méry-sur-Oise emerged in the 14th century when Pierre I of Orgemont, Chancellor of France, erected a fortress between 1375 and 1389 on the Oise riverbank north of Paris. Following damage during the Wars of Religion, Claude d'Orgemont rebuilt the castle around 1584 in the Renaissance style. The 18th century brought elegant modifications under the Molé and Lamaonion families, with landscape enhancements ordered by Bonne-Félicité Bernard with Buffon's assistance. Registered as a historical monument in 1937 and purchased by the municipality in 2004, the château now serves as a hotel and seminar center while its partially classified park remains open to the public.
