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Family:
Bibliography
  1. Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, vol 10, Oakham-Richmond. London: St Catherine Press, 1945. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Information from this source tagged as [Ref: CP X [Ap][p0-9].*].
  2. Holford, Matthew L, Family, lineage and society - medieval pedigrees of the Percy family, in Nottingham Medieval Studies, 2008, pp165-190. Available (for a fee) at https://www.brepolsonline.net/doi/epdf/10.1484/J.NMS.3.432. Information from this source tagged as [Ref: Holford PERCY p[0-9]*].
  3. Richardson, Douglas, Royal Ancestry. Salt Lake City, Utah: Douglas Richardson, 2013. NYPL JFF 16-1184 v1-5 Information from this source tagged as [Ref: Richardson RoyalAnc v4p[0-9]*].

Sources for birth and parent Information
parents:
[Ref: Richardson RoyalAnc v4p347],
father:
[Ref: Holford PERCY p169]
Research Notes:
no evidence has been found of the existence of an alleged eldest son William [Ref: CP X p456(g)]



Pedigree of William De PERCY
                                                                /-----Lambert I The Bearded Count Of Louvain
                                                       /-----Lambert II The Belted Count Of Louvain
                                                      |         \-----Gerberga Of Lorraine
                                              /-----Henry II Of Brabant, Count Of Lorraine
                                             |        |         /-----Gothelo I Duke Of Upper And Lower Lorraine
                                             |         \-----Oda Of Lorraine
                                             |                  \-----Ita
                                     /-----Godfrey I The Bearded Duke Of Brabant
                                    |        |                  /-----Frethehard Count In Teisterbant
                                    |        |         /-----Eberhard Of Betuew And Teisterbant
                                    |         \-----Adelaide Of Betuew
                            /-----Jocelin LOUVAIN, Lord Of Petworth
                   /-----Sir Henry De PERCY
                  |        |                                    /-----(Unk) De PERCY
                  |        |                           /-----William Algernon De PERCY, Baron Of Topcliffe
                  |        |                  /-----Alan De PERCY, Baron Of Topcliffe
                  |        |                 |        |         /-----Hugh De PORT, Baron Of Basing
                  |        |                 |         \-----Emma De PORT
                  |        |                 |                  \-----Orence
                  |        |         /-----William De PERCY, Baron Of Topcliffe
                  |        |        |        |                  /-----Ralph De GANT, Lord Of Aalst
                  |        |        |        |         /-----Gilbert De GANT, Baron Of Folkingham
                  |        |        |        |        |         \-----Gisele Of Luxembourg
                  |        |        |         \-----Emma De GANT
                  |        |        |                 |         /-----Hugh De Montfort, Baron Of Haughley
                  |        |        |                  \-----Alice De MONTFORT
                  |        |        |                           \-----Alice Of Beaufour
                  |         \-----Agnes De PERCY
                  |                 |                           /-----Richard FITZ GILBERT De CLARE, Baron Of Clare
                  |                 |                  /-----Gilbert FITZ RICHARD, Baron Of Clare
                  |                 |                 |         \-----Rohese GIFFARD
                  |                 |         /-----Richard FITZ GILBERT De CLARE, Baron Of Clare
                  |                 |        |        |         /-----Hugh Count Of Clermont
                  |                 |        |         \-----Adeliza De CLERMONT
                  |                 |        |                  \-----Margaret De Roucy
                  |                  \-----Adeliza De TUNBRIDGE
                  |                          |                  /-----Ranulph II De MESCHINES, Vicomte De Bayeux
                  |                          |         /-----Ranulph III De MESCHINES, Earl Of Chester
                  |                          |        |         \-----Margaret Le Goz
                  |                           \-----Adeliza Le MESCHIN
                  |                                   |         /-----Thorold Of Buckingham, Sheriff Of Lincoln
                  |                                    \-----Lucia Of East Angies
                  |                                             \-----(Unk Dau)
          /-----Sir William De PERCY, Baron Of Topcliffe
         |        |                                             /-----Sir Robert De BRUS
         |        |                                    /-----Adam De BRUS
         |        |                           /-----Robert De BRUS, Baron Of Skelton
         |        |                          |        |         /-----Sir William RAMSAY
         |        |                          |         \-----Emma
         |        |                  /-----Adam De BRUS, Baron Of Skelton
         |        |                 |        |                  /-----William PAYNEL
         |        |                 |        |         /-----Fulk PAYNEL
         |        |                 |         \-----Agnes PAYNEL
         |        |                 |                 |         /-----William FITZ ANSCULF, Baron Of Dudley
         |        |                 |                  \-----Beatrix
         |        |         /-----Adam II De BRUS, Baron Of Skelton
         |        |        |        |                           /-----Stephen II Count Of Champagne
         |        |        |        |                  /-----Eudes Count Of Champagne, Lord Of Holderness
         |        |        |        |                 |         \-----Adela
         |        |        |        |         /-----Stephen Of Aumale, Lord Of Holderness
         |        |        |        |        |        |         /-----Robert I The Devil Duke Of Normandy
         |        |        |        |        |         \-----Adelaide Of Normandy
         |        |        |        |        |                  \-----Herleve Of Falaise
         |        |        |         \-----Agnes Of Aumale
         |        |        |                 |                  /-----Roger De MORTIMER
         |        |        |                 |         /-----Ralph De MORTIMER, Baron Of Wigmore
         |        |        |                 |        |         \-----Hawise
         |        |        |                  \-----Hawise De MORTIMER
         |        |        |                           \-----Milicent
         |         \-----Isabel De BRUS
         |                 |                           /-----(Unk)
         |                 |                  /-----Osbert De ARCHES
         |                 |         /-----William De ARCHES
         |                 |        |         \-----Maud
         |                  \-----Juetta De ARCHES
         |                           \-----Jueta
 /-----Sir Henry De PERCY, Baron Of Topcliffe
|        |                                    /-----(Unk) De BALLIOL
|        |                           /-----Hugh De BALLIOL
|        |                  /-----Joscelin De BALLIOL
|        |         /-----Ingram De BALIOL
|         \-----Ellen BALIOL
|                 |         /-----Walter De BERKELEY
|                  \-----(Unk Dau) De BERKELEY
William De PERCY
|                                                               /-----Geoffrey Ferreol Count Of The Gatinais
|                                                      /-----Fulk IV Rechin Count Of Anjou
|                                                     |         \-----Ermengarde Of Anjou
|                                             /-----Fulk V The Young Count Of Anjou, King Of Jerusalem
|                                            |        |         /-----Simon I De MONTFORT, Seigneur Of Montfort L'Amau
|                                            |         \-----Bertrade De MONTFORT
|                                            |                  \-----Agnes Of Evereux
|                                    /-----Geoffrey Plantagenet Count Of Anjou, Duke Of Normandy
|                                   |        |                  /-----John De BAUGENCY, Seigneur De La Fleche
|                                   |        |         /-----Helias Count Of Maine
|                                   |        |        |         \-----Paula Of Maine
|                                   |         \-----Erembourg Of Maine
|                                   |                 |         /-----Gervase Seigneur De Chateau-Du-Loir
|                                   |                  \-----Matilda De Chateau-Du-Loir
|                                   |                           \-----Aremburge
|                           /-----Hameline PLANTAGENET, Earl Of Surrey
|                  /-----William De WARENNE, Earl Of Surrey
|                 |        |                                    /-----Ralph II De Warrene
|                 |        |                           /-----William De Warrene, Earl Of Surrey
|                 |        |                          |         \-----Emma
|                 |        |                  /-----William II De Warrene, Earl Of Surrey
|                 |        |                 |        |         /-----Gherbod The Fleming, Advocate Of St. Bertins
|                 |        |                 |         \-----Gundred
|                 |        |         /-----William III De WARRENNE, Earl Of Surrey
|                 |        |        |        |                  /-----Henry I King Of France
|                 |        |        |        |         /-----Hugh Magnus Duke Of France
|                 |        |        |        |        |         \-----Anne Of Kiev
|                 |        |        |         \-----Isabel De Vermandois, Countess Of Leicester
|                 |        |        |                 |         /-----Herbert IV Count Of Vermandois
|                 |        |        |                  \-----Adelaide De Vermandois, Countess Of Vermandois
|                 |        |        |                           \-----Adela De Valois
|                 |         \-----Isabel De WARENNE, Countess Of Surrey
|                 |                 |                           /-----Roger De Montgomery, Earl Of Shrewsbury
|                 |                 |                  /-----Robert II De Belesme, Count Of Alencon
|                 |                 |                 |         \-----Mabel De Belesme
|                 |                 |         /-----William III TALVAS, Count Of Alencon And Ponthieu
|                 |                 |        |        |         /-----Guy I Count Of Ponthieu
|                 |                 |        |         \-----Agnes Of Ponthieu
|                 |                 |        |                  \-----Ada
|                 |                  \-----Ela TALVAS
|                 |                          |                  /-----Henry Of Burgundy
|                 |                          |         /-----Eudes I Borrel Duke Of Burgundy
|                 |                          |        |         \-----(Unk) Of Barcelona
|                 |                           \-----Helie/Alice Of Burgandy
|                 |                                   |         /-----William I The Great Count Of Burgundy
|                 |                                    \-----Matilda (Sibylle) Of Burgundy
|                 |                                             \-----Stephanie Of Barcelona
|         /-----John De WARENNE, Earl Of Surrey
|        |        |                                    /-----Robert Marshal
|        |        |                           /-----Gilbert GIFFARD, Marshal
|        |        |                  /-----John Fitz GILBERT The Marshal
|        |        |                 |        |         /-----Geoffrey De VENOIZ
|        |        |                 |         \-----(Unk dau) De VENOIZ
|        |        |         /-----Sir William MARSHALL, Protector, Earl Of Pembroke
|        |        |        |        |                           /-----Girold DAPIFER
|        |        |        |        |                  /-----Edward De SARESBERIE, Baron Of Trowbridge
|        |        |        |        |                 |         \-----Wulfwynn Of Cresswell
|        |        |        |        |         /-----Walter De SALISBURY, Baron Of Chitterne
|        |        |        |         \-----Sibyl De SALISBURY
|        |        |        |                 |                  /-----Hugh
|        |        |        |                 |         /-----Patric De CHAWORTH, Baron Of Kempsford
|        |        |        |                  \-----Sibyl De CHAWORTH
|        |        |        |                          |         /-----Ernulph De HESDIN, Baron Of Keevil
|        |        |        |                           \-----Matilda De HESDIN
|        |        |        |                                    \-----Emmeline
|        |         \-----Maud MARSHALL
|        |                 |                                    /-----Richard FITZ GILBERT De CLARE, Baron Of Clare
|        |                 |                           /-----Gilbert FITZ RICHARD, Baron Of Clare
|        |                 |                          |         \-----Rohese GIFFARD
|        |                 |                  /-----Gilbert De CLARE, Earl Of Pembroke
|        |                 |                 |        |         /-----Hugh Count Of Clermont
|        |                 |                 |         \-----Adeliza De CLERMONT
|        |                 |                 |                  \-----Margaret De Roucy
|        |                 |         /-----Richard "Strongbow" De CLARE, Earl Of Pembroke
|        |                 |        |        |                  /-----Roger De Beaumont
|        |                 |        |        |         /-----Sir Robert De Beaumont, Earl Of Leicester
|        |                 |        |        |        |         \-----Adelise Of Meulan
|        |                 |        |         \-----Elizabeth De BEAUMONT
|        |                 |        |                 |         /-----Hugh Magnus Duke Of France
|        |                 |        |                  \-----Isabel De Vermandois, Countess Of Leicester
|        |                 |        |                           \-----Adelaide De Vermandois, Countess Of Vermandois
|        |                  \-----Isabel De CLARE, Countess Of Pembroke
|        |                          |                           /-----Murchad Mac DAIRMAIT, King Of Laigin And Leinste
|        |                          |                  /-----Donnchad Mac MURCHAD, King Of Dublin, Laigin, Lei
|        |                          |                 |         \-----Sadb
|        |                          |         /-----Dairmait Mac MURCHAD, King Of Leinster
|        |                          |        |        |         /-----Gilla Michil Ua Braenain
|        |                          |        |         \-----Orlaith
|        |                          |        |                  \-----Iuchdelb
|        |                           \-----Aoife Macmurchada Of Leinster
|        |                                   |                  /-----Gillacomghall Ua TUATHAIL
|        |                                   |         /-----Muirchertach Ua TUATHAIL, King Of Ui Muiredaig
|        |                                    \-----Mor Ua TUATHAIL
|        |                                            |         /-----Loigsech Ua MORDA, King Of Leix
|        |                                             \-----Cacht Of Leix
|        |                                                      \-----Gormflaith
 \-----Eleanor De WARENNE
         |                                                      /-----Hugh VI The Devil De Lusignan, Sire De Lusignan
         |                                             /-----Hugh VII Brunus Sire De Lusignan
         |                                            |         \-----Audearde Of Thouars
         |                                    /-----Hugh VIII Sire De Lusignan
         |                                   |         \-----Sarasine
         |                           /-----Hugh Sire De Lusignan
         |                          |        |                  /-----Geoffrey II Lord Of Marcillac And Taillebourg
         |                          |        |         /-----Geoffrey Of Rancon, Lord Of Taillebourg
         |                          |        |        |         \-----Fessifia
         |                          |         \-----Burgundia Dame De Fontenay
         |                  /-----Hugh IX De Lusignan, Sire De Lusignan
         |                 |         \-----Orengarde
         |         /-----Hugh X De Lusignan, Count Of La Marche
         |        |        |                                    /-----Geoffroy I Of Preuilly, Count Of Vendome
         |        |        |                           /-----Eschivard I Sire De Preuilly
         |        |        |                          |         \-----Euphrosine Countess Of Vendome
         |        |        |                  /-----Pierre I Sire De Preuilly
         |        |        |         /-----Pierre II Sire De Preuilly
         |        |         \-----Agatha De Preuilly
         |        |                  \-----Aenor De Mauleon
          \-----Alfais De LUSIGNAN
                  |                                             /-----Fulk Tailefer, Count Of Angouleme
                  |                                    /-----Guillaume III Tailefer, Count Of Angouleme
                  |                                   |         \-----Coudo VAGENA
                  |                           /-----Wulgrim II Tailefer, Count Of Angouleme
                  |                          |        |         /-----Guillen Amanieu II Vicount Of Bezaune And Benauges
                  |                          |         \-----Vitapol De Benauges
                  |                  /-----William Guillaume IV Tailefer, Count Of Angouleme
                  |                 |        |                  /-----Roger De Montgomery, Earl Of Shrewsbury
                  |                 |        |         /-----Roger Le POITEVIN, Count Of La Marche
                  |                 |        |        |         \-----Mabel De Belesme
                  |                 |         \-----Ponse De Montgomery
                  |                 |                 |         /-----Aldebert I Count Of La Marche
                  |                 |                  \-----Almodis Countess Of La Marche
                  |                 |                           \-----Ponira
                  |         /-----Aymer Tailefer, Count Of Angouleme
                  |        |        |                           /-----William Vicount Of Turenne
                  |        |        |                  /-----Boso I Vicount Of Turenne
                  |        |        |                 |         \-----Matilda
                  |        |        |         /-----Raymond I Vicount Of Turenne
                  |        |        |        |         \-----Gerberga Comtoresse De Terasson
                  |        |         \-----Marguerite De Turenne
                  |        |                 |                  /-----Routrou I Vicount Of Chateaudun, Count Of Mortagne
                  |        |                 |         /-----Geoffrey II De Perche, Count Of Perche
                  |        |                 |        |         \-----Adeline Of Belleme
                  |        |                  \-----Maude De Perche
                  |        |                          |         /-----Hildouin III De Rameru, Count Of Montdidier And Roucy
                  |        |                           \-----Beatrix De Montdidier
                  |        |                                    \-----Adele De Roucy
                   \-----Isabel Of Angouleme
                           |                                    /-----Henry I King Of France
                           |                           /-----Philip I King Of France
                           |                          |         \-----Anne Of Kiev
                           |                  /-----Louis VI The Fat King Of France
                           |                 |        |         /-----Florent I Count Of Holland
                           |                 |         \-----Bertha Of Holland
                           |                 |                  \-----Gertrude Of Saxony
                           |         /-----Peter Of France, Lord Of Courteney
                           |        |        |                  /-----Amadeus II Count Of Savoy
                           |        |        |         /-----Humbert II Count Of Maurienne And Savoy
                           |        |        |        |         \-----Adelaide
                           |        |         \-----Adelaide Of Savoy
                           |        |                 |         /-----William I The Great Count Of Burgundy
                           |        |                  \-----Gisele Of Burgundy
                           |        |                           \-----Stephanie Of Barcelona
                            \-----Alice De Courtenay
                                    |                           /-----Jocelin De Courtenay, Seigneur De Courtenay
                                    |                  /-----Miles Seigneur Of Courtenay
                                    |                 |         \-----Isabel De Montchery
                                    |         /-----Renaud De Courtenay, Seigneur De Courtenay
                                    |        |        |         /-----Renaud II Count Of Nevers And Auxerre
                                    |        |         \-----Ermengard De Nevers
                                    |        |                  \-----Ida Of Forez
                                     \-----Elizabeth De Courtenay
                                             |                  /-----Everhard Du DONJON
                                             |         /-----Frederick Du DONJON
                                              \-----Hedwig Du DONJON



Descendants of William De PERCY
1. William De PERCY