*William de Percy Lord of Topcliffe
born about 1193 Alnwick, Northumberland, England
died before 28 July 1245
buried before 28 July 1245 Salley Abbey, Craven, Yorkshire, England

father:
*Henry de Percy
born about 1156 Whitby, Yorkshire, England
died before 29 September 1198
buried before 29 September 1198 St Lo, Rouen, France

mother:
*Isabel le Brus
born about 1160 Skelton, Yorkshire, England
died after 1230
buried Whitby Abbey, N.riding, Yorkshire, England
married about 1182 Cleveland, Yorkshire, England

siblings:
Henry de Percy born about 1195 Alnwick, Northumberland, England died 12 January 1245/46

spouse (1st):
*Joan de Briwere
born about 1197 Stoke, Devonshire, England
buried before 12 June 1233 Hospital, Sandown, Surrey, England
married about 1223 Warwick, Warwickshire, England

children (from 1st marriage):
*Anastasia de Percy born about 1216/24 Alnwick, Northumberland, England
Joan de Percy born about 1224 Whitby, Yorkshire, England
Agnes de Percy born about 1226 Whitby, Yorkshire, England
Alice de Percy born about 1228 Whitby, Yorkshire, England

spouse (2nd):
*Eleanor (Elene)(Ellen)(Ellena) de Baliol
born about 1206 Red Castle, Angusshire, Scotland
died before 22 November 1281
married about 1234 Red Castle, Augusshire, Scotland

children (from 2nd marriage):
Ingelram de Percy born about 1230 Petworth, Northumberland, England
died 1262 buried before 24 October 1262
Walter de Percy born about 1233 Petworth, Northumberland, England
*Henry de Percy born about 1235 Whitby, Yorkshire, England
died 29 August 1272 Sallay, Craven, Yorkshire, England
buried Sallay Abbey, Craven, Yorkshire, England
William de Percy born about 1237 Whitby, Yorkshire, England
Geoffrey de Percy born about 1239 Petworth, Northumberland, England
Galfrid de Percy born about 1240 Whitby, Yorkshire, England
Alan de Percy born about 1241 Whitby, Yorkshire, England

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com