Britain's Royal Families: The Complete Genealogy, rev. ed. @ p 48, s of Henry I & Sybilla Corbet, but notes "there is no
certain evidence to show that Sybilla was really Robert's
mother, who may have been an unknown woman of Caen"

The cited information was published by Pimlico Random House, London, England, 1989, 1996 (Ref: p 48, s of Henry I & Sybilla Corbet, but notes "there is no
certain evidence to show that Sybilla was really Robert's
mother, who may have been an unknown woman of Caen") The author/originator was Alison Weir.

• Source Notes

  ABBR Britain's Royal Families

• References (2)
  • Parent Source: Britain's Royal Families: The Complete Genealogy, rev. ed.
  • Individual: Robert de Caen "the Consul" Earl of Gloucester