His parentage is confirmed by the undated charter under which [his mother] "Emma mater Hilberti de Lacei" donated property "in monte…Mainart" to Saint-Amand on becoming a nun. The Chronique de Normandie, based on le Roman de Rou, names "le sire de Lacy" (twice) among those who took part in the conquest of England in 1066, one of which entries presumably refers to Ilbert de Lacy. A manuscript history of the Lacy family records that “Ilberto de Lacy” accompanied William “the Conqueror” to England and was awarded “dominio et honore de Pontefracto”, adding that he was buried “ad dextrum cornu altaris sancti Benedicti” (which appears from the context to refer to Pontefract Priory). Domesday Book records “Ilbert de Lacy” holding Tingewick in Rowley Hundred in Buckinghamshire; several properties in Nottinghamshire; numerous properties in Yorkshire; land in Dunholme, Scothern, Stow and Willingham by Stow in Lincolnshire. “Hilbertus de Laceio…cum Hadrude uxore mea” donated property to the Holy Trinity of the Mount, Rouen, for the souls of “…filiique mei Hugonis” who was buried there, by charter dated to [1088/94]. King William II confirmed “consuetudinem de castellaria castelli sui” to “Ilberto de Laceio” as held in the time of King William I and of “Baiocensis episcopi”, by charter dated to [1088/95]. A charter of King Henry II records donations to York St Mary, including the donation of land “in Meretona et in Gerford” by “Ilbertus de Laci”. The Liber Vitæ of Durham names "Ilbertus de Laceio, Hathewis sua uxor, Rodbertus et Hugo filii eorum".
The date of his death can only be assessed imprecisely, but the documentation suggests that it took place during the first half of the reign of King William II. 1
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