Earl Of Cornwall William De Mortaigne Earl Of Cornwall 
William De was born in 1080 in Cardinan, Cornwall, England. William De's father was Robert De Mortaigne Earl Of Cornwall and his mother was Maud De Montgomery. His paternal grandparents were Harlevin ( Herluin) Conteville [Vicount] and Arlette Herleve De Falaise. 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 at the age of 60 in 1140. He was buried in Lord Of Cardinan.-
Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- b.~ 0889 in Flanders, Belgium d.27 Mar 0964
- b.~ 0933 in Flanders, France d.01 Nov 0962
- b.0915 in Vermandois, Normandy, France d.10 Oct 0960 in Bruges, Aquitaine, France
- b.~ 0965 in Of, Conteville, France d.Unknown
- b.~ 0922 in Of Saxony, Germany d. in Saxony, Germany
- b.0949 in Saxony d.25 May 1008
- b.~ 0952 in Westerbourg, Saxony, England
- b.1001 in Conteville, Normandy, France d.1066
- b.~ 0974 in Of, Mellent, Normandy, France
- b.1031 in Mortagne-Au-Perche, Orne, Normandy, France d.08 Dec 1095 in France
- b.0978 in Falaise, Calvados, France d.Unknown in France
- b.~ 1003 in Falaise, Calvados, France d.1050 in Abbey Of St Grestain, France
- b.~ 0980 in Falaise, Clavados, France d.Unknown
- b.1080 in Cardinan, Cornwall, England d.1140
- b.~ 1041 in Montgomery, Normandy, France d.1107
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