Thorold was Seignor de Pont-Audemer.
Research Note: "According to the Continuator of William Jumièges, bk. viii, c. 37, Thorold was the son of a certain Torf, and he married either "Wewa' or "Awelina," sisters of Gunnor, wife of Duke Richard I. For a discussion as to the correct interpretation of this passage, see Geoffrey H. White, "Gunnor, Duchess of Normandy," in Genealogist, N.S., vol. xxxvii, pp. 57-65. According, however, to R. N. Sauvage, L'Abbaye de Saint-Martin-de-Troarn, p. 6, note, chapters 35-37 are not by Robert de Torigni, the author of the rest of the eighth book, but are interpolations. The genealogical mistakes which they contain are numerous, and it is impossible to rely on their uncorroborated testimony. Thorold must therefore be regarded as the earliest authenticated ancestor. Pont-Audemer was the original home of the family. Vieilles, Beaumont, and Beaumontel were part of the endowment of the Abbey of Bernay, and are mentioned in the charter of confirmation of Duke Richard II in 1027 (Le Prevost, Notes sur I'Eure, vol. i, p. 284), but in or before 1035 Ralph, custos of Bernay, and afterwards Abbot of Mont-St. Michel, ceded them to Humphrey de Vieilles (Robert de Torigni—ed. DeHsle—vol. ii, p. 194). [1]
[1] George E. Cokayne and Vicary Gibbs, ed., The Complete Peerage, rev., Vol. 7, Husee to Lincolnshire (London: St. Catherine Press, 1929), 521, note (c).