|Date of birth|
|Date of death||1100|
Geoffrey de Mandeville (died c. 1100), also known as de Magnaville (from the Latin de Magna Villa "of the great town"), was a Constable of the Tower of London. Mandeville was a Norman, from one of several places that were known as Magna Villa in the Duchy of Normandy. These included the modern communes of Manneville-la-Goupil and Mannevillette. Some records indicate that Geoffrey de Mandeville was from 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. About 1085 he and Lescelina, his second wife, founded Hurley Priory as a cell of Westminster Abbey.
He married firstly, Athelaise (Adeliza) (d. bef. 1085), by whom he had:
- William de Mandeville (d. bef. 1130), married Margaret dau. 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.
He married secondly Lescelina, by whom he had no children.
- Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis, Line 158A-23.
|Peerage of England|
| Constable of the Tower of London
William de Mandeville