Sibyl de Falaise 
Sibyl's father was William de Falaise. She was an only child. Sibyl is no longer alive.
Details of Sibyl's family with Baldwin de Boulers Lord Montgomery
Sources/Citations
University of Hull Royal Database (England), Author Address: @ Sybillia of Falaise. Issue of Henry I, uncertain of mother. Not
shown in The Complete Peerage, but shown by Weir as having an
unknown mother., Complete Peerage, Location: Mid-Continent Library, Independence @ daughter of William de Faleise?, The Royal Bastards of Medieval England @ possible issue of Henry I, no mother, Britain's Royal Families: The Complete Genealogy, rev. ed. @ p 49, d of Henry I, no mother, SUSANNA KEENE.FTW
University of Hull Royal Database (England), Author Address: @ Sybillia of Falaise. Issue of Henry I, uncertain of mother. Not
shown in The Complete Peerage, but shown by Weir as having an
unknown mother., Complete Peerage, Location: Mid-Continent Library, Independence @ daughter of William de Faleise?, The Royal Bastards of Medieval England @ possible issue of Henry I, no mother, Britain's Royal Families: The Complete Genealogy, rev. ed. @ p 49, d of Henry I, no mother, SUSANNA KEENE.FTW
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Family Genogram.
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