Loyd indicates that this family originated in Lassy in the present-day French département of Calvados, arrondissement Vire, canton Condé-sur-Noireau. This is corroborated by the two documents, dated to [1133] and Sep 1146... which list the fiefs of the bishop of Bayeux and include the Lacy fief in Campeaux, the latter being located about 20 kilometres west of Lassy. The main English estates of the senior branch of the family, descended from Ilbert de Lacy, formed the honor of Pontefract in South Yorkshire, while the estates of the younger branch, descended from Walter de Lacy, were centred on Weobley in Herefordshire.
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, which could refer to Ilbert de Lacy and his father or to Ilbert and his supposed brother Walter. Ellis suggests that the father of Ilbert and Walter was named Hugh "for each gave this name to a son". No other information has been found concerning this person.
Married Emma, daughter of ---. "Emma mater Hilberti de Lacei" donated property "in monte…Mainart" to Saint-Amand on becoming a nun, by undated charter. Ellis dates this charter to before 1069. 1
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