Family
ClaimDetailEvidence
FatherWilliam Marshal I, 3rd Earl of Pembroke (~1146-1219) [S756] [S775:III] [S925]
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MotherIsabel de Clare Countess of England (e1172-1220) [S775:III] [S925]
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Spouse 1stGilbert de Clare, 7th Earl of Clare (~1180-1230) 
Child +Richard de Clare, 8th Earl of Clare (1222-1262) [S756] [S954]
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Spouse 2ndRichard, 2nd Earl of Cornwall (1209-1272) 
Attributes
ClaimDetailEvidence
GenderFemale
NameIsabel Marshal [S756] [S954]
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NameIsabel [S775:III]
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FatherWilliam Marshal I, 3rd Earl of Pembroke (~1146-1219) [S756] [S775:III] [S925]
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MotherIsabel de Clare Countess of England (e1172-1220) [S775:III] [S925]
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Timeline
ClaimDateDetailAgeEvidence
BirthOct 9, 1200England [S925]
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Marriage 1stOct 9, 1214Gilbert de Clare, 7th Earl of Clare (~1180-1230) [S925] [S954]
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Marriage 1st1217Gilbert de Clare, 7th Earl of Clare (~1180-1230) [S756] [S925] [S954]
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Marriage 2ndMar 1231Richard, 2nd Earl of Cornwall (1209-1272), Fawley, near Marlow, Buckinghamshire, England [S756] [S775:III] [S925] [S925] [S954]
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DeathJan 1239/40Berkhampstead, England [S756] [S775:III] [S925]
died of jaundice in childbirth
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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).
[S925] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - England Earls 1138-1143)" (2006-7 (v.1.1 Updated 26 Jun 2006 )).
[S954] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - England Earls 1067-1122)" (2006-7 (v1.1 Updated 23 April 2007)).
Kinship Lines for Isabel Marshal
Spouse/PartnerDegreeRelationshipMRCA
Gilbert de Clare, 7th Earl of Clare (~1180-1230)83rd CousinGilbert fitz Richard I, Lord of Cardigan (e1060-~1117)
Gilbert de Clare, 7th Earl of Clare (~1180-1230)83rd CousinSir Robert de Beaumont I, 1st Earl of Leicester (~1046-1118)
Gilbert de Clare, 7th Earl of Clare (~1180-1230)83rd CousinAdelisa de Clermont (e1061-)
Gilbert de Clare, 7th Earl of Clare (~1180-1230)83rd CousinIsabel de Vermandois (e1081-)
Richard, 2nd Earl of Cornwall (1209-1272)125th CousinHenry I, King of France (?1009-1060)
Richard, 2nd Earl of Cornwall (1209-1272)125th CousinHildouin de Ramerupt IV, Count of Montdidier (e1010-~1063)
Richard, 2nd Earl of Cornwall (1209-1272)125th CousinAdelaide de Roucy (>1014-1062)
Richard, 2nd Earl of Cornwall (1209-1272)125th CousinAnna Iaroslavana of Keiv (1036-~1078)
Richard, 2nd Earl of Cornwall (1209-1272)167th CousinRichard I, Duke of Normandy (~932-996)
Richard, 2nd Earl of Cornwall (1209-1272)187th Cousin 2x removedTorf (e923-)
Richard, 2nd Earl of Cornwall (1209-1272)198th Cousin 1x removedHerbert de Vermandois II, Count of Vermandois and Troyes (~880-943)
Richard, 2nd Earl of Cornwall (1209-1272)198th Cousin 1x removedLiegarde of France (e887-)