Here is the profile from Keats-Rohan's Domesday Descendants (pp.262):
de Abrincis, Rivallon
Rivallon of Avranches, lord of Folkstone, Kent, by marriage with Matilda de Muneville, granddaughter and heiress of William Arques. (BL Harley 4757, copy of Bermondsey register, fol. 3, Henry I orders Roger sheriff of Surrey and Gilbert his nephew to ensure Bermondsey has the grants made by Nigel de Muneville 'et gener eius Rivallonus de Abrincis'). Occurs from the beginning of Henry's reign; the king had apparently given him the royal manor of Stanton Harcourt by May 1101 (RRAN ii, 528; Chron. Abing. ii, 84-85). Occurs in charters of St Andrew, Northhampton, associated with Turgis d'Avranches, of whom he was perhaps a close relative; possibly both were related to Bishop Turgis of Avranches (1093-1134). Father of William d'Avranches and Matilda alias Felicia, wife of Humphrey de Milières.
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