• General Notes

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  On the Percies: The founder of the family was a Danish chieftain, Manfred, who died in 880. His son, Galfred, was a general of Rollo's in Normandy. The next of importance would be William, who came with the Conqueror , and who was the first Lord Percy. He died in 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 survived 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 continued.
  
  G.E.Cokayne--Complete Peerage is a good source if you read the  footnotes.
  
  "Ancestral Roots" 7th Edition
  "Magna Charta Sureties 1215" 4th Edition
  "Americans of Royal Descent" 7th Edition
  "Historical Southern Families" Vol. II
  "Complete Peerage"
  
  Schwennicke (ed.) Europaische Stammtafeln, iii, 710-712, lists from William de Percy, m. Emma de Port down to Henry de Percy m. Eleanor de Poynings.

Details of William de Percy I's family with Emma de Port