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International Society of Royal Descendants - Bloodroyal and Sangreal
Agnes de Percy - 1134 
Joscelyn de Louvain - 4th Baron of Percy - 1090 in North Riding, Yorkshire & Agnes de Percy - Co heir of her father Baron de Percy - 1134-1205 - her siblings were: Maude de Percy, Alan de Percy, William de Percy
daughter of:
William de Percy - 4th Baron Percy - 1112-1168
m: #1 - Spouse: Adeliza de Tunbrigg - Children: Walter de Percy, Richard de Percy 
m: #2 - Spouse: Unknown - Children: Maude de Percy, Agnes de Percy, Alan de Percy, William de Percy 
son of:
William de Percy - Baron Percy & Alice de Ros - daughter of:  Everard - Baron de Ros 
son of:
Alan de Percy - Baron Percy & Emma de Gaunt - daughter of:  Gilbert de gaunt - Baron of Folkingham - grand-dau of: Baldwin - Count of Flanders
Alan,s siblings were: Walter de Percy, William de Percy, Richard de Percy 
son of:
William de Percy - Baron Algernon Percy - 1034-1096 & Emma de Port - Heiress of Semar by Scarborough. 
William was a Norman Knight settled in Yorkshire in 1067. 1st Baron Percy. Died in sight of Jerusalem 1096 - Lived at Topcliffe Manor Yorkshire. 
William's siblings were: Alan de Percy, Serlo de Percy, Picot de Percy 
son of:  Geffrey de Percy - 1010
son of:  William de Percy - 0974
son of:  Geffrey de Percy - 0940