 Lanfranc assigned a knight called Ralph, probably a lay retainer from Normandy, to run the estate, and appointed Ralph's son, William de Enysford, to the role on his father's death.Lanfranc remained concerned about the threat posed by Odo, and authorised William to improve the defences at Eynsford.The work was probably carried out between 1085 and 1087, and enclosed the former "burh" with a stone curtain wall to form a castle.