 Complete the following phrase:  The house was built in 1760 on the site of a former Medieval castle. For centuries, the house and surrounding lands remained in the same noble family, the viscounts de Butler. In the late nineteenth century it came into the possession of Senator Jules Elby, connected by marriage to the Leroy and du Merle families. A member of the Elby family was involved in the design of the Paris Métro, and a white-tiled underground passageway still exists between the château and its former stables. During the First World War, the château was used by the British Army as an operations centre and Remaisnil lies close to the 