Commentary
Weis: "half-brother, William de Mandeville, Earl of Essex."
van de Pas: "from her half-brother William de Mandeville, Earl of Essex, as her maritagium the manor of Streatley, Berkshire."
Burke (pg 369) "sister of Humphrey de Bohun, Earl of Hereford"
Family
ClaimDetailEvidence
FatherGeoffrey fitz Piers, 4th Earl of Essex (e1159-1213) [S756] [S3175]
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MotherAveline de Clare, Countess of Essex (e1170-~1225) [S756] [S3175]
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Spouse 1stSir Reynold de Mohun II, Lord of Dunster (~1200-1258) 
Child +Alice de Mohun (e1228-1251) [S756] [S3175]
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Attributes
ClaimDetailEvidence
GenderFemale
NameHawise fitz Geoffrey [S756]
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NameHawise de Mandeville [S3175]
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FatherGeoffrey fitz Piers, 4th Earl of Essex (e1159-1213) [S756] [S3175]
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MotherAveline de Clare, Countess of Essex (e1170-~1225) [S756] [S3175]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1207
 
Marriage 1stbef 1227Sir Reynold de Mohun II, Lord of Dunster (~1200-1258) [S756]
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Marriage 1staft May 29, 1227Sir Reynold de Mohun II, Lord of Dunster (~1200-1258) [S3175]
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Deathbef 1241/42 [S925] [S3175]
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Deathbef 1244 [S756]
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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).
[S925] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - England Earls 1138-1143)" (2006-7 (v.1.1 Updated 26 Jun 2006 )).
[S3175] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - English Lords, L-O)" (https://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMEDIEVAL3L-O.htm).
Kinship Lines for Hawise fitz Geoffrey
Spouse/PartnerDegreeRelationshipMRCA
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)177th Cousin 1x removedRichard II, Duke of Normandy (e979-1026)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)177th Cousin 1x removedJudith of Brittany (~982-1017)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)188th CousinConan de Rennes, Duke of Brittany (e938-992)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)188th CousinErmengarde d’Anjou (e965-)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)198th Cousin 1x removedReginar III Comte de Hainaut (~920-973)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)198th Cousin 1x removedHugh Capet, King of France (~941-996)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)198th Cousin 1x removedAdela (e921-961)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)198th Cousin 1x removedAdelaide (~945-~1004)
Sir Reynold de Mohun II, Lord of Dunster (~1200-1258)219th Cousin 1x removedGerberga of Saxony (914-984)