Nielsen Hayden genealogy
Family: Henry de Percy / Idoine de Clifford (F3344)
m. Abt 1318-
Male
Henry de Percy
Birth 1299 Death 26 Feb 1352 Warkworth, Northumberland, England 
Burial Alnwick, Northumberland, England Marriage Abt 1318 [1] Father Henry de Percy | F622 Group Sheet Mother Eleanor de Arundel | F622 Group Sheet
Female
Idoine de Clifford
Birth of Appleby, Westmorland, England Death 24 Aug 1365 Burial Beverley Minster, Yorkshire, England Father Robert de Clifford | F282 Group Sheet Mother Maud de Clare | F282 Group Sheet
Female
+ Isabel Percy
Birth Death Between 13 Sep 1349 and 25 May 1368 Burial Spouse William de Aton | F13231 Marriage Bef Jan 1327
Female
+ Eleanor de Percy
Birth Death Bef 18 Oct 1361 Burial Dunmow Priory, Little Dunmow, Essex, England Spouse John Fitz Walter | F13784 Marriage
Male
+ Henry de Percy
Birth Between 1322 and 1325 of Alnwick, Northumberland, England Death Abt 18 May 1368 Warkworth, Northumberland, England Burial Alnwick Abbey, Northumberland, England Spouse Mary of Lancaster | F11215 Marriage Bef 5 Sep 1334
Female
+ Maud Percy
Birth Abt 1345 Alnwick, Northumberland, England Death Bef 18 Feb 1379 Burial Durham Cathedral, Durham, Durham, England Spouse John de Neville | F577 Marriage Bef 1362
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Sources - [S1018] John Watson, 10 Feb 2016, post to soc.genealogy.medieval.
- [S1018] John Watson, 10 Feb 2016, post to soc.genealogy.medieval.