Charles Cawley, "Normandy: Arques, Aumâle, Caux, Rouen, Eu: Chapter 4 Eu: A. Com...

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Charles Cawley, "Normandy: Arques, Aumâle, Caux, Rouen, Eu: Chapter 4 Eu: A. Comtes d"Eu 996-1040, descendants of Geoffrey de Brionne", Medieval Lands: A prosopography of medieval European noble and royal families, (v4.1 Updated 06 August 2017), Foundation for Medieval Genealogy, (http://fmg.ac/Projects/MedLands/normacre.htm#GeoffreyBrionnedied1015B accessed 30 September 2017).

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