General Notes

Maud d'Avranches, lady of Oakhampton, and of du Sap in Normandy, daughter and heir of Robert d'Avranches, lord of Oakhampton, co. Devon. [Ancestral Roots]

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Maud d'Avranches, the latter being heiress of Baldwin Fitz Gilbert's family, which had held the honour of Okehampton and the Shrievalty of Devon 1080-1142.  [Burke's Peerage]

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Maud de Abrincis m. 1st, --- Deincourt, by whom she had a dau., Hawise, m. to Sir Reginald de Courtenay. Maud m. 2ndly, Robert FitzEdith, natural son of King Henry I, and had another dau., Matilda, m. to William de Courtenay, brother of Sir Reginald. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, London, 1883, p. 140, Courtenay, Barons Courtenay, Earls of Devon]

Note Burke's newest Peerage (1999 - not extinct) has a different story to tell.  Maud (Matilda) married Reginald (Renaud) and Hawise married the son (also name Reginald or Renaud).  No mention is made of who married Renaud I's brother William.  Plus Maud de Abrincis is named "Maud D'Avranches".  Plus Hawise is dau of de Coucy - not Deincourt.  (note - Plantagenet ancestry also has Deincourt.  I have Hawise Deincourt as Reginald, the father's 1st wife.).  I am going with the newest Burke (1999).