Career
He was a Norman from Magna Villa in the Duchy of Normandy. There are a number of communes that were anciently referred to as Magna Villa such as Manneville-la-Goupil, Mannevillette and others Some records may indicate he was from today"s Thil-Manneville, in Seine-Maritime, Haute-Normandy (upper Normandy).
An important Domesday tenant-in-chief, de Mandeville was one of the ten richest magnates of the reign of William the Conqueror.
William granted him large estates, primarily in Essex, but in ten other shires as well. He served as the first sheriff of London and Middlesex, and perhaps also in Essex, and in Hertfordshire.
He was the progenitor of the de Mandeville Earls of Essex. William de Mandeville (d bef 1130), married Margaret daughter of Eudo, dapifer, who m.
2ndly Otuer fitz Count.
Beatrice de Mandeville, m. Geoffrey fitz Eustace, natural son of Eustace II, Count of Boulogne. Geoffrey was Lord of Carshalton, Surrey Walter, who was also one of his tenants in 1086.
