Commentary
Foundation of Medieval Genealogy (Medieval Lands - Norman Dukes) says 'According to Dudo of Saint-Quentin, he was an illegitimate son of Richard I by a mistress other than Gunnora ... Guillaume of Jumièges names “unus Godefridus, alter...Willelmus” as the two sons of Richard “ex concubinis”, ... Robert of Torigny names "unus Godefridus alter…Willermus" as sons of "Ricardi primi ducis Normanniæ" by concubines'
Family
ClaimDetailEvidence
FatherRichard I, Duke of Normandy (~932-996) [S905] [S2855]
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SpouseLesceline de Harcourt (e979-1058) 
Child +Robert d’Eu, Comte d’Eu (e1016-~1093) [S905]
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Attributes
ClaimDetailEvidence
GenderMale
NameGuillaume , Comte d'Hiemois et d'Eu [S905]
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NameGuillaume de Normandie [S905]
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NameGuillaume , Comte d'Eu [S905] [S2855]
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NameWilliam , Count of Eu
no source
FatherRichard I, Duke of Normandy (~932-996) [S905] [S2855]
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TitleCount of Eu [S905]
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TitleCount of Hiemois [S905]
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Timeline
ClaimDateDetailAgeEvidence
Birth978France [S905] [S2855]
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Death1057 [S905] [S2855]
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Sources
IndexTitle
[S905] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Normandy: Alencon, Evereux, Meulan, Perche)" (2006-7 (v1.1 Updated 02 March 2007)) (https://fmg.ac/Projects/MedLands/NORMANDY NOBILITY.htm).
[S2855] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Norman Dukes)" (https://fmg.ac/Projects/MedLands/NORMANDY.htm).