Claim: The House of Percy was founded in 1067 by William de Percy, 1st feudal baron of Topcliffe in the Kingdom of England, United Kingdom.
Evidence: The House of Percy descended from William de Percy (d. 1096), a Norman who crossed over to England after William the Conqueror in early December 1067, was created 1st feudal baron of Topcliffe in Yorkshire, and was rebuilding York Castle in 1070. Kingdom of England, United Kingdom