William I (Willame) de Percy (d. 1096/9), 1st feudal baron of Topcliffe in North Yorkshire,[1] known as Willame als gernons (Old French, meaning 'with whiskers'), was a Norman nobleman who arrived in England immediately after the Norman Conquest of 1066. He was the founder via an early 13th-century female line of the powerful English House of Percy, Earls of Northumberland, and via an 18th-century female line of the Dukes of Northumberland.
- ^ Sanders, I.J., English Baronies, Oxford, 1960, p.148