Ilbert de Bois-l'Evêque, Seigneur de Bois-l'Évêque, le Mareschal

Some of these references are about his grandson Ilbert II:

Orderic Vitalis wrote (in The Ecclesiastical History of England and Normandy, Volume 3, p. 277) "Ilbert de Lacy and his mother Havise were owners of Bois l"Eveque, near Darnetal." He also posits Engerrard, son of Hilbert, as being Ilbert's son. "For genealogy of this family, see Monastic. Anglican, p. 859)."

Richard Holmes, in Pontefract: Its Name, Its Lords, and Its Castle (1878): [Notes, not quoted, from p 65ff]

• Enguerrard de Lacy was governor of Caen in 1106
• Hugh de Lacy, youngest son of Ilbert, became Abbot at Selby in 1069--so Ilbert, as Lord of Pontrefact, contributed the Manor of Hambleton towards the Abbey's maintenance.
• Otherwise, little to nothing is known of Ilbert other than that he founded or rebuilt Pontrefact Castle and its Church of St. Clement
• he survived King William since he received from King William Rufus granting him chastelery of his castle and in those of the Bishop of Bayeux
• author is skeptical about Dugdale who said Ilbert was buried at the right corner of the altar of St. Benedict (probably in St. John's monastery in Pontrefact) and who proposes a family tree of Ilbert I then Robert then Ilbert II
• his wife was Avisia or Hawise (mother of Robert)
• It is probable but unproved that Ilbert and Hawise were owners of Bois-l'Eveque, near Darnetal near Rouen. and that Emma de Lacy (a nun at St. Amand) was Ilbert's sister
• Enguerrand, son of Hilbert (i.e. Ilbert) was a benefactor to the nunnery in which Emma lived
• From Lansdowne Manuscript: Hugh de Lacy founded priory of Lanthony on Wales (dedicated 1008), died without progeny so heirs were sisters Ermeline and Emma. Ermeline died, so the whole inheritance passed to Emma's son Gilbert de Lacy.
• Robert de Lacy the only clearly proven son of Ilbert who survived him. Orderic calls him Robert FitzIlbert; was granted from William Rufus all the lands his father held when he died and then c 1090 founded Monastery at Pontrefact. In donations, he names Ilbert and Hawise as his parents. Robert later married Matilda.
• Robert is frequently confounded, in Orderic and elsewhere, with his cousin Roger de Lacy of Hereford
• When Robert de Lacy was disgraced, his estates were transferred to Hugh de Laval, then to William Traverse or Maltravers.
• Boothroyd has conflicting dates for when Robert died, from 1107-1138; author says most likely he was dispossessed in 1122 and had a young son named Ilbert by a new wife then died before 1130 without being restored his honours.