Family
ClaimDetailEvidence
FatherOsbern de Crépon (e984-~1042) [S905] [S2260:265] [S2611]
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MotherEmma d’Ivry (e985-) [S905] [S2260:265] [S2611]
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Spouse 1stAdeliza de Toeni (e1015-) 
Child +Emma Fitz Osbern (e1047-<1099) [S756] [S954] [S2260:265]
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Spouse 2ndRichilde de Mons, Countess of Hainaut (e1031-1088) 
Attributes
ClaimDetailEvidence
GenderMale
NameWilliam FitzOsbern , 1st Earl of Hereford [S775:XIIa.753]
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NameWilliam fitz Osbern , Earl of Hereford [S1660:117]
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NameWilliam fitz Osbern [S756]
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NameWilliam Fitz Osbern , Earl of Hereford [S756]
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NameGuillaume FitzOsbern [S905] [S954] [S2611]
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NameWilliam Fitz osbern de Breteuil [S2260:265]
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FatherOsbern de Crépon (e984-~1042) [S905] [S2260:265] [S2611]
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MotherEmma d’Ivry (e985-) [S905] [S2260:265] [S2611]
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Brother-in-lawRalph de Toeni III (~1025-~1102) [S1660:117]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1014 (1011-1014)
 
Living1014 [S905]
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Marriage 1stbef 1046Adeliza de Toeni (e1015-) [S954]
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Military1066 [S756] [S905] [S954] [S2611]
companion of the Conqurer at the Battle of Hastings
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Title10671st Earl of Hereford [S756] [S905] [S954]
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Marriage 2nd1070Richilde de Mons, Countess of Hainaut (e1031-1088) [S3164]
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Marriage 2ndaft Jul 1070Richilde de Mons, Countess of Hainaut (e1031-1088) [S954]
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Marriage 2ndbef 1071Richilde de Mons, Countess of Hainaut (e1031-1088) [S756]
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DeathFeb 22, 1071Ravenchoven, near Cassel, Flanders, France [S905] [S954] [S2611]
killed in battle by the forces of Robert le Frison
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S775] George Cokayne, "Complete Peerage" (https://dcms.lds.org/delivery/DeliveryManagerServlet?dps_pid=IE83409).
[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).
[S954] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - England Earls 1067-1122)" (2006-7 (v1.1 Updated 23 April 2007)).
[S1660] Sanders, I. J., "English Baronies, A Study of Their Origin and Descent 1086-1327" (Oxford at the Carendon Press, 1960).
[S2260] John Fitchett Marsh, "Annals of Chepstow Castle" (1883) (https://books.google.com/books?id=JTEQAAAAYAAJ).
[S2611] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Normandy: Aumale, Rouen, Eu )" (v4.2 Updated 30 May 2018) (https://fmg.ac/Projects/MedLands/normacre.htm).
[S3164] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Flanders: Hainaut)" (v4.10 Updated 11 December 2023) (https://fmg.ac/Projects/MedLands/FLANDERS, HAINAUT.htm).
Note
It is known that William Fitz Osbern was grandnephew of Gunnora, Duchess of Normandy.