General Notes

Sibyl (or Adela or Lucia) Corbet, living 1157, daughter and coheir of Robert Corbet, mistress of Henry I, lady of Alcester, co. Warwick and of Pontesbury and Woodcote, co. Salop (by Henry I she was mother of Reginald Fitz Roy, Earl of Cornwall).  [Ancestral Roots]

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The following additional info was supplied by Curt Hofemann, curt_hofemann@@yahoo.com:

no evidence to prove that Henry I married Sibyl [Ref: Sheppard Apr65 p96]

It is because of Henry I's personal propensities that we know something of two Corbet women who occur in the records of this period. Of his numerous mistresses Sibyl Corbet, elder daughter of Robert fitz Corbet of Longden, must have been a favourite since she bore four, possibly five, of Henry's illegitimate children. [Ref: CP XI Appendix D]

She had a younger sister Alice. Where, when and how the liaison began between Henry and Sibyl is a mystery. He had already had children by various mistresses: among the oldest must have been Juliane, who married Eustace de Pacy lord of Breteuil in 1103, and rebelled against her father; and Robert, born of an unknown woman of Caen, who was created earl of Gloucester by his father in 1122. [Ref Corbet citing: CP V:683: the suggestion that he was the son of Sibyl Corbet is probably correct]

The known children by Sibyl Corbet were Rainaud de Dunstanville, his brother William and sisters Gundred and Rohese; it is also possible, but not certain, that Sibyl was the mother of the king's illegitimate daughter Sibyl who was married to Alexander after he became king of the Scots in 1107. [Ref: Corbet citing: A.C. Lawrie, Early Scottish Charters, Glasgow 1905:charter XXXVI to Scone Priory, Alexander I, c. 1120, witnessed by Queen Sibyl and her brother William; she died 12 June 1122 on an island in Loch Tay to which Alexander granted charter XLVII, to canons of Scone]

Note 1: Sheppard = Walter Lee Sheppard, Royal Bye-Blows II: The Illegitimate Royal Offspring from Edward III To Queen Anne, NEHGR vol 21, 1967.

Note 2: Corbet = The Corbett Study Group, http://website.lineone.net/~corbett_group/First/people.htm
specifically: The Anglo Norman Corbets by Barbara Coulton.

Regards,
Curt