Family
ClaimDetailEvidence
FatherHeribert du Maine I, Count of Maine (~990-<1036) [S759] [S916] [S965]
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Spouse 1stThibaut III, Count of Blois (~1010-1089) 
Child +Stephen, Count of Blois (e1049-1102) [S916] [S2718]
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Attributes
ClaimDetailEvidence
GenderFemale
NameGersende du Maine [S916] [S965]
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NameGersende of Maine [S759]
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NameGersende de Maine [S2718]
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FatherHeribert du Maine I, Count of Maine (~990-<1036) [S759] [S916] [S965]
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Timeline
ClaimDateDetailAgeEvidence
Birth 1025 - 1030France [S916] [S965]
Source: Cawley says between 1025 and 1035, and that her marriage was repudiated in 1048. If we assume she married no later than 1047, then we can assume she was born before about 1032 and probably sooner.
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Marriage 1stbef 1048Thibaut III, Count of Blois (~1010-1089) [S916] [S965]
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Repudiated1048 [S916] [S965]
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Marriage 2nd 1049 - 1051 [S916] [S965]
Alberto Azzo d'Este II (d 1097)
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Sources
IndexTitle
[S759] Farmerie, Todd A., "Medieval Genealogy Newsgroup: Weis : Ancestral Roots, 7th Edition - Corrections" (Gen-Medieval-L Mailing List, Aug 1995) (http://archiver.rootsweb.com/th/read/GEN-MEDIEVAL/1995-08/0807311777).
[S916] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Central France: Blois, Tours)" (2006-7 (v1.1 Updated 18 October 2006)) (https://fmg.ac/Projects/MedLands/CENTRAL FRANCE.htm).
[S965] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Maine: Counts)" (2006-7) (https://fmg.ac/Projects/MedLands/MAINE.htm).
[S2718] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - England Kings 1066-1837)" (v4.1 Updated 24 November 2019).