From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Walter_de_Lacy_(died_1085) retrieved 15 March 2015

c) ILBERT de Lacy (-[1093], bur [Pontefract Priory]). "Emma mater Hilberti de Lacei" donated property "in monte…Mainart" to Saint-Amand on becoming a nun, by undated charter[9]. 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[10]. 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)[11]. 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[12]. “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 is buried there, by charter dated to [1088/94][13]. 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”[14]. The Liber Vitæ of Durham names "Ilbertus de Laceio, Hathewis sua uxor, Rodbertus et Hugo filii eorum"[15].

m HAWISE, daughter of ---. “Robertus de Laceio” founded Pontefract Priory, for the soul of “Hylberti patris mei et Hawisiæ matris meæ”, by undated charter[16]. “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 is buried there, by charter dated to [1088/94][17]. It is not known whether “Hadrude” was a mistranscription for Hawise, or whether Ilbert had two wives with these names. A manuscript history of the Lacy family records that “Ilberto de Lacy…uxor eius” was buried “ad sinistrum cornu altaris [sancti Benedicti]” (which appears from the context to refer to Pontefract Priory)[18]. The Liber Vitæ of Durham names "Ilbertus de Laceio, Hathewis sua uxor, Rodbertus et Hugo filii eorum"[19]. Ilbert & his wife had three children:

i) ROBERT de Lacy (-after 23 Nov 1102, bur Pontefract Priory). A manuscript history of the Lacy family names “Robertum Lacy” as son of “Ilberto de Lacy” and his wife “Hauisia”, adding that he founded “monasterium apud Pontefractum”, died during the reign of King William II, and was buried at Pontefract[20]. - see below.

ii) HUGH (-bur Holy Trinity of the Mount, Rouen). “Rodbertus de Laceio” confirmed the donation by “pater meus Hilbertus” to Selby Abbey, for the soul of “fratris mei Hugonis”, by undated charter[21]. “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 is buried there, by charter dated to [1088/94][22]. The Liber Vitæ of Durham names "Ilbertus de Laceio, Hathewis sua uxor, Rodbertus et Hugo filii eorum"[23].

iii) [MATILDA . “Henricum de Laceio” founded Kirkstall Abbey, for the souls of “Ilberti avi mei et Hawis uxoris suæ…et Matildis amitæ”, by undated charter[24].]

---------------------------

Sources:

Keats-Rohan, K.S.B. Domesday Descendants: A Prosopography of Persons Occurring in English Documents, 1066-1166. The Boydell Press, 2002. p. 537.

Hadvisa died before 1100.