William de Mortaigne , Earl of Cornwall 
William de was born before 1084 in Mortagne-au-Perche, Orne, Normandy, France. William de's father was Robert de Mortaigne , Earl of Cornwall and his mother was Maud de Montgomery. His maternal grandparents were Roger II de Montgomery , 1st Earl of Shrewsbury and Mabel de Talvas d' Alencon. He had three sisters named Emma de, Agnes de and Denise de. He was the youngest of the four children. He had a half-sister named Miss de. He died in 1140 in Bermondsey, London, England (as a Cluniac monk).General Notes
EARLDOM of CORNWALL
William de Mortain, Earl of Cornwall, also Count of Mortain, son and heir. He appears to have been b. before 1084, and to have coveted the Earldom of Kent, held by his uncle, Eudes (1067-97), and, being disappointed thereof, to have rebelled, with Robert de Belleme, against the King in Normandy, in an endeavor to recover that Duchy for Robert, the King's elder brother. They were defeated and taken prisoners, 24 Apr 1106, at Tinchebray, when, being attainted, his honours became forfeited. He m. Adilidis. After many years' imprisonment, he became a Cluniac monk, in 1140, at Bermondsey, where he d., probably sp. [Complete Peerage, III:418-9]
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Ancestor Pedigree Chart
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- b.~ 1031 in Mortagne-au-Perche, Orne, Normandy, France d.08 Dec 1095 in Abbey of St. Grestain, Normandy, France
- b.< 1084 in Mortagne-au-Perche, Orne, Normandy, France d.1140 in Bermondsey, London, England (as a Cluniac monk)
- b.~ 1022 in St Germain Montgomery, Normandy, France d.>27 Jul 1094 in Shrewsbury, Shropshire, England (clothed as a monk)
- b.~ 1051 in Montgomery, Normandy, France d.< 1085 in Abbey of St. Grestain, Normandy, France
- b.1026 in Alencon, Eure, Normandy, France d.02 Dec 1079 in Bures Castle, Eure, Normandy, France (murdered)
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They had a son named Aldhelm de.
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