Robert of Torigny refers to the wife of "Symone comite Huntedoniæ" as "filia Roberti comitis Legecestriæ" but does not name her.[2]
It is likely that Isabelle was the eldest child as she gave birth to her own first child in c. 1138.
Her second marriage is confirmed by charter dated 1187 under which “Gervasius Paganellus” donated property to Tykford Priory, with the consent of "my wife Isabelle countess of Northampton" (“uxoris meæ Isabellæ comitissæ de Norhamton”), which names "Fulk Paynell my grandfather and Ralph Paynell my father" (“Fulcodius Paganellus avus meus et Radulfus Paganellus pater meus”), witnessed by “Simone comite Northamptoniæ, Isabella comitissa matre eius” [3]
Research Notes
"Lade" is most likely a typo for "Lady". There is no such daughter of Robert de Beaumont 2nd Earl of Leceister and Amice Gael listed by the latest authority, Royal Ancestry by Douglas Richardson, Vol III, page 558-559.
Sources
↑Royal Ancestry: A Study in Colonial and Medieval Families, by Douglas Richardson (2013), Vol I, page 281
WikiTree profile Beaumont-426 created through the import of heinakuu2011-6.ged on Jul 5, 2011 by Johanna Amnelin.
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Countess Isabelle was born c1122 in Leicester or Normandie and married 1137 in Leicester, children’s dates and chronological order are wrong, for details and sources see Earl Simon’s profile.
Beaumont-426 and Beaumont-87 appear to represent the same person because: there is no such daughter as "Lade" in available sources (exception: trees and gedcoms). Lade is most likely a typo for "Lady", and is applied (with the same sources - trees and gedcom - to Isabelle Beaumont, daughter of Robert the 2nd Earl of Leicester. Recommend merging. Please!