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Male William Earl of Cornwall de Mortaigne Click to view William Earl of Cornwall de Mortaigne in the family tree

William Earl of Cornwall was born about 1062 in Cornwall,England.1   William Earl of Cornwall's father was Robert Earl of Cornwall, Count of Mortain de Mortaigne and his mother was Matilda (Maud) de Montgomery.  His paternal grandparents were Harlevin De CONTEVILLE and Harlette De FALAISE. He had two sisters named Agnes and Emma.  He was the youngest of the three children.  He died after 1140.1 


William Earl of Cornwall's first family with Isabel Fitz Richard de Clare

They had a daughter named Beatrice.


William Earl of Cornwall's second family

He had a biological son named Aldhelm (Adelmus).

1 http://www.my-ged.com/hbradley (Bradley database)
2 http://www.gendex.com/users/Enf_Bry/Enf_Bry/index.html (Enf-Bry)
Further source/citation:
Pedigree Resource File CD 6

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