William III de Percy 
William III de was born in 1112.1 William III de's father was William II de Percy and his mother was Alice de Ros. His paternal grandparents were Alan de PERCY and Emma de GAUNT. He was an only child. He died in of Topcliffe.1 General Notes
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TITL History of the House of Percy PUBL London, 1902 MEDI Book
TEXT Has him s. of William de Percy & Alice de Ros
TEXT d 1168, no place
TEXT 4th Baron, no mention of other titles.
TITL Complete Peerage AUTH G.E. Cockayne
PUBL St. Catherine Press, 29 Great Queen St, Kingsway, W.C. 1959 excellent
Mid-Continent Library Genealogy Reference section, Independence, MO
MEDI Book
TEXT Has him s. of Alan de Percy & Emma de Gant
TEXT d. prob 1174/75, no place
TEXT 3rd Baron.
_FA1 PLAC Canon of York. 3rd/4th Baron.
_FA2 PLAC Founded Sallay Abbey.
TITL Borthwick, Richard contributor to soc.genealogy.medieval rgbor@@CYLLENE.UWA.EDU.AU
MEDI Electronic
TEXT Has him s. of Alan de Percy & Emma de Gant
TEXT d bef 1175
MEDI ElectronicOn the Percies: The founder of the family was a Danish chieftain, Manfred, wh o died in 880. His son, Galfred, was a general of Rollo's in Normandy. The next of importanc e would be William, who came with the Conqueror , and who was the first Lord Percy. He died i n 1097. The descendants of his son, Alan, founded the Percies of Heyshott and William's son , Richard, founded the Percies of Dunsley. Of the Children of William II, only daughters surv ived and of these only one had children. She married Josceline de Lovain, brother of Adeliza , second wife of Henry II. Josceline changed his name to Henry de Percy and the line conti nued.
G.E.Cokayne--Complete Peerage is a good source if you read the footnotes.
There may be other descents, but the following is a patrilineal (father-to-son-to-son) descen t:
Lambert I C of Louvain (-1015) m. Gerberga of Lower Lorraine
Lambert II C of Louvain (-1062) m. Oda of Lower Lorraine
Henry II C of Louvain (-1079) m. Adelaide von Betuwe
Godfrey D of Brabant (-1139) = ??
Joscelin de Louvain (-1180) m. Agnes de Percy
Henry de Percy (-1198) m. Isabel de Bruns
William de Percy (-1245) m. Ellen de Balliol
Henry de Percy (1235-1272) m. Eleanor de Warenne
Henry de Percy 1 B Percy (1273-1314) m. Eleanor de Arundel
Henry de Percy 2 B Percy (-1352) m. Idoine de Clifford
Henry de Percy 3 B Percy (-1368) m. Mary of Lancaster
Henry de Percy 1 E Northumberland (1341-1408) m. Margaret de Neville
Henry Percy (1364-1403) "Hotspur"
Hope this helps.
William Addams Reitwiesner wrei@@loc.gov
Schwennicke (ed.) Europaische Stammtafeln, iii, 710-712, list from William de Percy, m. Emm a de Port down to Henry de Percy m. Eleanor de Poynings. However the third generation whic h you list is omitted. I.e., the William who m. Adeliza de Clare is listed as son of Alan an d Emma de Gant.
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Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- d.1096 in of Topcliffe
- b.1069 d.BEF. FEB 1135/36 in of Topcliffe
- b. in of St. John, Hampshire
- d.1133
- b.1004 in of Gand, Flanders, Belgium d.1032 in Belgium
- b.~ 1022 in Of, Gand, Flanders, Belgium d.> 1052
- b.1005 in of Flanders, Belgium
- b.1048 in Of, Alost, Flanders, Belgium d.1094
- b.~ 0965 d.06 Oct 1019
- b.~ 1028 in Of, Flanders, Belgium d.1058
- b.~ 0965
- b.~ 1071 in Of, Folkingham, Lincolnshire, England
- d.~ 1048
- b.~ 1020 in Of, Montfort, Normandy, France d.1088
- b.~ 1050 in Of, Montfort-Sur-, Risle, France
- b.~ 1015 in Of, Beauffou, Normandy, France
- b.1112 d. in of Topcliffe
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Details of William III de's family with Alice de Clare
Details of William III de's family with Sibyl de Valognes
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