 1112 - 1175 (63 years)
Generation: 1
| 1. |  4th Baron Percy William de Percy was born in 1112 in Topcliffe, North Riding, Yorkshire, England; died in Apr 1175 in Salley Abbey, Craven, Yorkshire, England. Notes:
Died:
Age: 63
William married Adeliza (Alice) de Clare in 1134. Adeliza (daughter of Lord of Tonbridge Lord of Cardigan Richard FitzGilbert de Clare and Alice de Meschines) was born in 1121 in Tonbridge, Kent, England; died after 1148 in Tonbridge, Kent, England. [Group Sheet] [Family Chart]
Children:
- 2. Agnes de Percy
 was born in 1134 in Alnwick, Northumberland, England; died on 13 Oct 1203 in Petworth, Sussex, England.
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Generation: 2
| 2. |  Agnes de Percy (1.William1) was born in 1134 in Alnwick, Northumberland, England; died on 13 Oct 1203 in Petworth, Sussex, England. Agnes married 5th Baron Percy Joscelin de Louvain in 1154 in Egmanton, Nottinghamshire, England. Joscelin (son of Count of Leuven and Brussels, Landgraves of Brabant Godfrey de Leuven, Duke of Lorraine I and of Burgundy Clementia) was born in 1121 in Louvain, Brabant, Belgium; died on 29 Sep 1180 in Petworth, Sussex, England. [Group Sheet] [Family Chart]
Children:
- 3. Henry de Percy was born on 20 Sep 1160 in Alnwick, Northumberland, England; died on 29 Sep 1198 in Rouen, Seine-Maritime, Haute-Normandie, France.
- 4. Richard de Percy was born about 1170; died in 1244.
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Generation: 3
| 3. | Henry de Percy (2.Agnes2, 1.William1) was born on 20 Sep 1160 in Alnwick, Northumberland, England; died on 29 Sep 1198 in Rouen, Seine-Maritime, Haute-Normandie, France. Family/Spouse: Isabel de Brus. Isabel was born in 1160 in Skelton, Yorkshire, England; died in 1230. [Group Sheet] [Family Chart]
Children:
- 5. 6th Baron Percy William de Percy was born in 1183 in Alnwick, Northumberland, England; died before 28 Jul 1245 in Salley Abbey, England; was buried in Sutton-in-Craven, North Yorkshire, England.
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Generation: 4
| 5. | 6th Baron Percy William de Percy (3.Henry3, 2.Agnes2, 1.William1) was born in 1183 in Alnwick, Northumberland, England; died before 28 Jul 1245 in Salley Abbey, England; was buried in Sutton-in-Craven, North Yorkshire, England. Notes:
William de Percy was only 15 when his father died, and now became by right Baron de Percy, but his uncle, Richard de Percy, found no difficulty in usurping not only the administering of the entire estates of the family, but even the baronial title as well. He married Eleana, daughter of Inglegram de Baliol, and her relatives gradually induced William to assert himself. Richard defied every effort to dislodge him, and when the King himself was appealed to, a compromise was effected by which Richard was left in undisputed possession of the barony and estates until his death, after which William was to inherit both, to the exclusion of the usurper's sons, who died sine prole. When William, 7th Baron Percy, at length came into his own, he was in his 52nd year, and died in 1245.
Died:
Age: 52
William married Eleanor de Baillol about 1234 in Red Castle, Angushire, Scotland. Eleanor (daughter of Ingelram (Ingram) de Baillol and Agnes de Berkeley) was born in 1200 in Red Castle, Augushire, Scotland; died in 1281. [Group Sheet] [Family Chart]
Family/Spouse: Joan de Briwere. Joan (daughter of 2nd Lord of Horsley William de Briwere and Beatrice de Vaux) was born in 1187 in Stoke, Devonshire, England. [Group Sheet] [Family Chart]
Children:
- 13. Agnes de Percy was born about 1225 in Alnwick, Northumberland, England.
- 14. Anastacia de Percy was born in 1218 in Alnwick, Northumberland, England.
- 15. Joan de Percy was born about 1221 in Alnwick, Northumberland, England.
- 16. Alice de Percy was born about 1223 in Alnwick, Northumberland, England.
- 17. Ada de Percy was born in 1210 in Alnwick, Northumberland, England.
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