Translated from French wikipedia:

Guillaume (I) de Tancarville (circa 1075-1129), son of Raoul, chief chamberlain of Normandy and England. It seems certain that he is the chamberlain of Duke Robert Courthose and his brother Henry Beauclerc, after his victory at the Battle of Tinchebray (1106). He was a close adviser to King Henry I of England. He was a frequent witness to his actions, and also performed the function of judge. Considered a lord permanently loyal to the king by Orderic Vital, he was at his side at the seige of the Chateau d'Eu in 1089. He participated in the Battle of Bremule (1119) alongside the king of England against the king of France during a chance meeting in Vexin. According to Henry of Huntingdon, it was he who commanded the rebel force that captured Galeran IV Meulan Bourgtheroulde in 1124. However, the Norman chronicler Orderic Vitalis did not mention this in his account of this event. Guillaume founded the Abbey of Saint-Georges de Boscherville (c. 1112/1113), which replaces the college founded by his father. Through his sponsorship, it attracted a large number of donations, including that of King Henry I who gave him the port of Bénouville. This became the burial place of the family. He married Mathilde d'Arques, heiress of a powerful family.

-http://fmg.ac/Projects/MedLands/normacre.htm#GuillaumeTancarvilledi...
iii) GUILLAUME [I] de Tancarville (-1129). Guillaume chamberlain confirmed the donation to the abbey of St Georges de Bocherville by Raoul, chief chamberlain of William I King of England, and his sons Raoul, Nigel and Guillaume, and their mother Avicia, with the consent of his sons Rabel and Robert and Lucy, recorded in a charter of Henry I King of England dated 1114[828]. "…Willo de Tancvilla…" subscribed the charter dated to [10 Apr/29 May] 1121 which records the arrangements for the marriage of "Miloni de Gloec" and "Sibilia filia Beorndi de Novo Mercato"[829]. Henry I King of England confirmed an earlier donation to the abbey of Sainte-Barbe by "Odo Stigandus", at the request of "Guillelmi camerarii de Tancarvilla [%E2%80%A6nepos supradicti Odonis Stigandi] et Rabelli filii sui", by charter dated 1129[830]. Henry II King of England confirmed the property of Savigny abbey, including the donation by "Guillelmi camerarii de Tancharvilla" of "landam de Tor", by charter dated to [1156/58][831]. Henry II King of England confirmed the possessions of the priory of Sainte-Barbe-en-Auge, including donations by "Rabelli Camerarii…Willelmus camerarius pater eius…Willelmi Camerarii filii Rabelli", by charter dated to [1185/89][832].

m MATHILDE d’Arques, daughter of GUILLAUME d’Arques & his wife Beatrix Malet. Guillaume de Jumièges records "Mathildis" as the daughter of “Willelmi de Archis”, adding that she married “Willelmus camerarius de Tancarvilla” by whom she had “filium Rabellum qui ei successit”[833]. Guillaume [I] & his wife had three children:

• (a) RABEL de Tancarville (-1140). Guillaume de Jumièges records "Mathildis" as the daughter of “Willelmi de Archis”, adding that she married “Willelmus camerarius de Tancarvilla” by whom she had “filium Rabellum qui ei successit”[819].
• (b) ROBERT de Tancarville . Guillaume chamberlain confirmed the donation to the abbey of St Georges de Bocherville by Raoul, chief chamberlain of William I King of England, and his sons Raoul, Nigel and Guillaume, and their mother Avicia, with the consent of his sons Rabel and Robert and Lucy, recorded in a charter of Henry I King of England dated 1114[820].
• (c) LUCY de Tancarville ). Guillaume chamberlain confirmed the donation to the abbey of St Georges de Bocherville by Raoul, chief chamberlain of William I King of England, and his sons Raoul, Nigel and Guillaume, and their mother Avicia, with the consent of his sons Rabel and Robert and Lucy, recorded in a charter of Henry I King of England dated 1114[821]. The primary source which confirms her marriage has not yet been identified. m WILLIAM de Vernon, son of RICHARD Seigneur de Reviers & his wife Adelise Peverel (-[16 Jun] after [1147]).

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Upon his marriage to Maud d'Arques, Guillaume de Tancarville acquired the lands in Normandy that had previously belonged to Goscelin, vicomte de Rouen (Maud's great-grandfather), which alliance allowed Guillaume to transform the small church his father had established at Bocherville into the grand abbey St.-Georges-de-Boscherville. [Domesday Studies: Papers Read at the Novocentenary Conference of the Royal ...
edited by J. C. Holt, James Clarke Holt, p. 246, footnote]

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https://en.wikipedia.org/wiki/Tancarville_family?fbclid=IwAR05bo2_9...