Ilbert was a major participant in the Harrying of the North (1069–70) which effectively ended the quasi-independence of the region through large-scale destruction that resulted in the relative "pacification" of the local population and the replacement of local Anglo-Danish lords with Normans. In return, he received vast grants of land in West Yorkshire, where he built Pontefract Castle.
The Honour of Pontefract, which included the manor of Stanbury, was maintained by Ilbert's direct male descendants for the next three generations until 1192. It continued in the female line until 1348.
|Offspring of Ilbert de Lacy, 1st Baron of Pontefract and unknown parent|
|Robert de Lacy (c1075-)||1075 England|