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William De Percy

William's father was Henry De Percy II and his mother is Idonea De Clifford. His paternal grandparents were Henry De Percy and Eleanor Fitzalan. He had five brothers and four sisters, named Henry, Richard, Robert, Thomas, Roger, Maud, Margaret, Eleanor and Isabel. He died in 1355.

Ancestor Pedigree Chart
- Henry De Percy ^*
  
  William De Percy
  - b.1183 at Alnwick Castle d.1245
  
  Isabel Balliol ^*
  
  Sir Henry De Percy
  - b.1235 at Alnwick Castle d.29 Aug 1272
  
  Ingleram Balliol
  
  Eleanor Balliol
  - b.~  1202 d.<  1290 at Alnwick Castle
  
  Agnes De Barclay
  
  Henry De Percy
  - b.25 Mar 1273 at Alnwick Castle d.Oct 1314
  
  John De Warenne
  - b.Aug 1231
  
  Eleanor De Warenne
  - b.1251 d.<  1325
  
  Alice De Brun
  - b.1224
  
  Henry De Percy II
  - b.~  1301 d.25 Feb 1352
  
  John Fitzalan
  - b.14 Sep 1246 d.18 Mar 1271
  
  Eleanor Fitzalan
  - b.1270 d.1328
  
  Roger Wigmore De Mortimer
  
  Isabel De Mortimer
  - b.14 Sep 1246 at Wigmore Abbey
  
  Maud De Bruce
  
  William De Percy
  - d.1355
  
  Idonea De Clifford
  
  ^*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)