WILLIAM DE VESCY, son and heir, by 1st wife, adopted his mother's name of Vescy, by which he and his successors were known. He was Sheriff of Northumberland, 1157-70, and of the Honor of Lancaster, 1166-70. At the Inquest of 1166 his carta showed that his tenants held of him 26 knights' fees, plus one third and one seventh of a fee. When William the Lion invaded Northern England in 1174 and laid siege to de Vescy's own castle of Alnwick, he was one of those who, after a forced march, raised the siege, 13 July, and took the Scottish King prisoner. On 16 March 1176/7, when Henry II arbitrated between the Kings of Castile and Navarre, he was among the witnesses of the award. He was a benefactor of many religious houses.
He married, before 1169-71, Burga, daughter of Robert DE STUTEVILLE, by his wife Helewise. Having taken the habit of a monk at Alnwick Abbey, he died shortly before Michaelmas 1183 and was buried near the door of the Chapter House there. His widow, who was living in 1185, was buried with him. [Complete Peerage XII/2:274-5, (transcribed by Dave Utzinger)]