A manuscript history of the Lacy family names “Hilbertum et Henricum” as the two sons of “Robertum Lacy” and his wife “Matilda”, adding that he died childless and was buried “ad sinistrum cornu altaris sancti Benedicti” next to his mother. “Illebertus de Laceio” confirmed the donations made to Pontefract by “pater meus Robertus de Laceio” by charter dated to [1135/6 Feb 1141], witnessed by “Willelmo Folioth, et Henrico fratre meo, Rogero Pictaviensi et Warnero”. "Ilbertus de Lacy" confirmed the grant of "magna Merlay, Twisleton…et…in Poterton et…in Cliderh…" made by "pater meus" ... to "Radulfo le Rus", with the consent and advice of "Roberti fratris mei", by charter dated to [1135/41]. The Historia of Richard of Hexham records the restoration of “Ilbertus de Lesceio filius eius” to lands which King Henry I had confiscated from “patri suo Roberto de Lesci”. "Ilbertus de Lacy" confirmed the grant of "magnam Mitton, Haghton, magnam Merlay, Twisleton…in Potreton et…in Cliderhou" to "Radulfo le Rouse" and granted further property to "eidem Radulfo fratri meo" by charter dated to [1135/41]. Henry of Huntingdon records the presence at the battle of the Standard in 1138 of “Gillebertus [error for Ilbertus] de Laci”. Orderic Vitalis names “Ilbertus de Laceio” among those who fought for King Stephen at Lincoln [2 Feb 1141].
His date of death is set by an undated charter under which Roger de Mowbray and his wife Alice (Ilbert’s widow) donated property to the abbey of St. Mary, Hood, witnessed by William “decanus” who was consecrated bishop of Durham 20 Jun 1143, thus providing the latest date for the document. "Robertus regis filius Gloecestriæ consul" notified an agreement with the bishop of Bayeux relating to fiefs claimed by the latter, including “tota feoda Ilberti et Gilberti de Laceio...apud Laceium et apud Campels”, which were held “de Baiocensi ecclesia et de episcopo”, by charter dated Sep 1146. The reference to Ilbert in this document suggests that he was still alive at that date. 1
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