William de Mortaigne , Earl of Cornwall 
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Personal Details
William de Mortaigne , Earl of Cornwall
William de was born before 1084 in Mortagne-au-Perche, Orne, Normandy, France.1 He died in 1140 in Bermondsey, London, England (as a Cluniac monk).1
1 Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ III:428-9
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