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Bibliography
  1. Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, vol 12-2, Tracton-Zz. London: St Catherine Press, 1959. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Information from this source tagged as [Ref: CP XII/2 [Ap][p0-9].*].
  2. Richardson, Douglas, Sir Thomas Percy son of Thomas Percy, K.G., Earl of Worcester. Posting to soc.genealogy.medieval (email list GEN-MEDIEVAL) on 9/14/2013. Subject: C.P. Addition: New Light on Sir Thomas Percy [living 1417], son of Thomas Percy, K.G., Earl of Worcester [died 1403]. Available at https://groups.google.com/g/soc.genealogy.medieval/c/4YJhNYZLjxk/m/uveycLIfaJUJ. Author address: royalancestry at msn dot com. Information from this source tagged as [Ref: Douglas Richardson SGM 9/14/2013-140622].
  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
father:
[Ref: Richardson RoyalAnc v4p352]
illegitimate son [Ref: CP XII/2 p842(d), Douglas Richardson SGM 9/14/2013-140622]
Sources for death Information
date:
living 1417 [Ref: Douglas Richardson SGM 9/14/2013-140622]
Research Notes:
Knt [Ref: Richardson RoyalAnc v4p352]



Pedigree of Sir Thomas De PERCY
                                                                /-----Jocelin LOUVAIN, Lord Of Petworth
                                                       /-----Sir Henry De PERCY
                                                      |         \-----Agnes De PERCY
                                              /-----Sir William De PERCY, Baron Of Topcliffe
                                             |        |         /-----Adam II De BRUS, Baron Of Skelton
                                             |         \-----Isabel De BRUS
                                             |                  \-----Juetta De ARCHES
                                     /-----Sir Henry De PERCY, Baron Of Topcliffe
                                    |        |                  /-----Joscelin De BALLIOL
                                    |        |         /-----Ingram De BALIOL
                                    |         \-----Ellen BALIOL
                                    |                 |         /-----Walter De BERKELEY
                                    |                  \-----(Unk Dau) De BERKELEY
                            /-----Sir Henry PERCY, Lord Percy
                           |        |                           /-----Hameline PLANTAGENET, Earl Of Surrey
                           |        |                  /-----William De WARENNE, Earl Of Surrey
                           |        |                 |         \-----Isabel De WARENNE, Countess Of Surrey
                           |        |         /-----John De WARENNE, Earl Of Surrey
                           |        |        |        |         /-----Sir William MARSHALL, Protector, Earl Of Pembroke
                           |        |        |         \-----Maud MARSHALL
                           |        |        |                  \-----Isabel De CLARE, Countess Of Pembroke
                           |         \-----Eleanor De WARENNE
                           |                 |                  /-----Hugh IX De Lusignan, Sire De Lusignan
                           |                 |         /-----Hugh X De Lusignan, Count Of La Marche
                           |                 |        |         \-----Agatha De Preuilly
                           |                  \-----Alfais De LUSIGNAN
                           |                          |         /-----Aymer Tailefer, Count Of Angouleme
                           |                           \-----Isabel Of Angouleme
                           |                                    \-----Alice De Courtenay
                   /-----Henry De PERCY, Lord Percy
                  |        |                                    /-----John FITZALAN, Baron Of Oswestry
                  |        |                           /-----Sir John FITZALAN, Earl Of Arundel
                  |        |                          |         \-----Isabel D'AUBIGNY
                  |        |                  /-----Sir John FITZALAN, Earl Of Arundel
                  |        |                 |        |         /-----Theobald Le BOTELER
                  |        |                 |         \-----Maud De VERDUN
                  |        |                 |                  \-----Rohese De VERDUN
                  |        |         /-----Sir Richard FITZ ALAN, Earl Of Arundel
                  |        |        |        |                  /-----Ralph MORTIMER, Baron Of Wigmore
                  |        |        |        |         /-----Sir Roger MORTIMER, Baron Of Wigmore
                  |        |        |        |        |         \-----Gladys DHU
                  |        |        |         \-----Isabel MORTIMER
                  |        |        |                 |         /-----William De BRAIOSE, Baron Of Brecknock Castle
                  |        |        |                  \-----Maud De BRAOISE
                  |        |        |                           \-----Eve MARSHALL
                  |         \-----Eleanor FITZ ALAN
                  |                 |                           /-----Bonifacio Of Vasto
                  |                 |                  /-----Manfred III Margrave Of Saluzzo
                  |                 |                 |         \-----Maria Of Torres
                  |                 |         /-----Thomas I Margrave Of Saluzzo
                  |                 |        |        |         /-----Amadeus IV Count Of Savoy, Marquess Of Turin
                  |                 |        |         \-----Beatrice Of Savoy
                  |                 |        |                  \-----Anna Of Burgundy
                  |                  \-----Alasia Of Saluzzo
                  |                          |                  /-----Guglielmo II Marquis Of Ceva
                  |                          |         /-----George Of Ceva, Marquis Of Ceva
                  |                          |        |         \-----(Unk) De Vasto
                  |                           \-----Luisa Of Ceva
                  |                                    \-----Menzia De ESTE
          /-----Henry De PERCY, Lord Percy
         |        |                                             /-----Walter CLIFFORD, Baron Of Clifford
         |        |                                    /-----Roger CLIFFORD
         |        |                                   |         \-----Agnes De CONDET
         |        |                           /-----Roger CLIFFORD
         |        |                          |        |         /-----Robert De EWYES, Baron Of Ewyas Harold
         |        |                          |         \-----Sibilla De EWYAS
         |        |                          |                  \-----Petronilla
         |        |                  /-----Roger De CLIFFORD
         |        |                 |         \-----Maud
         |        |         /-----Robert De CLIFFORD, Lord Clifford
         |        |        |        |                           /-----Robert De VIPONT, Baron Of Appleby
         |        |        |        |                  /-----John De VIPONT, Baron Of Appleby
         |        |        |        |                 |         \-----Idonea De BUISLY
         |        |        |        |         /-----Robert De VESPONT
         |        |        |        |        |        |         /-----William De FERRERS, Earl Of Derby
         |        |        |        |        |         \-----Sibilla De FERRERS
         |        |        |        |        |                  \-----Agnes Of Chester, Lady Of Chartley
         |        |        |         \-----Isabel De VESPONT
         |        |        |                 |                  /-----Geoffrey FITZ PIERS, Earl Of Essex
         |        |        |                 |         /-----Sir John FITZ GEOFFREY
         |        |        |                 |        |         \-----Aveline De CLARE
         |        |        |                  \-----Isabel FITZ JOHN
         |        |        |                          |         /-----Hugh BIGOD, Earl Of Norfolk, MC Surety
         |        |        |                           \-----Isabel BIGOD
         |        |        |                                    \-----Maud MARSHALL
         |         \-----Idonia De CLIFFORD
         |                 |                                    /-----Richard De CLARE, Earl Of Hertford, MC Surety
         |                 |                           /-----Sir Gilbert De CLARE, Earl Of Hertford And Glouceste
         |                 |                          |         \-----Amice MEULANT, Countess Of Gloucester
         |                 |                  /-----Richard De CLARE, Earl Of Gloucester And Hertfor
         |                 |                 |        |         /-----Sir William MARSHALL, Protector, Earl Of Pembroke
         |                 |                 |         \-----Isabel MARSHALL
         |                 |                 |                  \-----Isabel De CLARE, Countess Of Pembroke
         |                 |         /-----Thomas DeCLARE, Lord Of Thomond
         |                 |        |        |                  /-----Roger De LACY, Baron Of Pontefract
         |                 |        |        |         /-----John De LACY, Earl Of Lincoln, MC Surety
         |                 |        |        |        |         \-----Maud De CLERE
         |                 |        |         \-----Maud De LACY
         |                 |        |                 |         /-----Robert De QUINCEY
         |                 |        |                  \-----Margaret De QUINCY, Heiress Of Lincoln
         |                 |        |                           \-----Hawise Of Chester, Countess Of Lincoln
         |                  \-----Maud De CLARE
         |                          |                           /-----Gerald FITZ MAURICE, Baron Of Offaly
         |                          |                  /-----Sir Maurice FITZ GERALD, Baron Offaly
         |                          |                 |         \-----Eve De BERMINGHAM
         |                          |         /-----Maurice FITZ MAURICE FITZ GERALD, Lord Of Offaly
         |                          |        |         \-----Juliane
         |                           \-----Julian FITZ MAURICE
         |                                   |                  /-----Philip De PRENDERGAST
         |                                   |         /-----Gerald De PRENDERGAST
         |                                   |        |         \-----Maude De QUENCI
         |                                    \-----Matilda De PRENDERGAST
         |                                            |         /-----Richard De BURGH, Lord of Connaught
         |                                             \-----Matilda De BURG
         |                                                      \-----Egidia (Jill) De LACY
 /-----Sir Thomas De PERCY, K.G., Earl Of Worcester
|        |                                                      /-----Geoffrey Plantagenet Count Of Anjou, Duke Of Normandy
|        |                                             /-----Henry II Curt Mantel PLANTAGENET, King Of England
|        |                                            |         \-----Matilda
|        |                                    /-----John Lackland PLANTAGENET, King Of England
|        |                                   |        |         /-----William VIII Count Of Poitou, Duke Of Aquitaine
|        |                                   |         \-----Eleanor Duchess Of Aquitaine
|        |                                   |                  \-----Eleanor De CHASTELLERAULT
|        |                           /-----Henry III King Of England
|        |                          |        |                  /-----William Guillaume IV Tailefer, Count Of Angouleme
|        |                          |        |         /-----Aymer Tailefer, Count Of Angouleme
|        |                          |        |        |         \-----Marguerite De Turenne
|        |                          |         \-----Isabel Of Angouleme
|        |                          |                 |         /-----Peter Of France, Lord Of Courteney
|        |                          |                  \-----Alice De Courtenay
|        |                          |                           \-----Elizabeth De Courtenay
|        |                  /-----Edmund Crouchback PLANTAGENET, King Of Sicily
|        |                 |        |                           /-----Alfonso II King Of Aragon
|        |                 |        |                  /-----Alfonso II Count Of Provence
|        |                 |        |                 |         \-----Sancha Of Castile
|        |                 |        |         /-----Raymond Berengar IV Count Of Provence And Forcalquier
|        |                 |        |        |        |         /-----Rainou Seigneur De Castellar, Count Of Forcalqu
|        |                 |        |        |         \-----Gersenda II Of Sabran
|        |                 |        |        |                  \-----Gersinde Of Forcalquier
|        |                 |         \-----Eleanor Of Provence
|        |                 |                 |                  /-----Humbert III Count Of Savoy
|        |                 |                 |         /-----Thomas I Count Of Savoy
|        |                 |                 |        |         \-----Beatrix Of Macon
|        |                 |                  \-----Beatrice Of Savoy
|        |                 |                          |         /-----William I Count Of Geneva
|        |                 |                           \-----Margaret Of Geneva
|        |                 |                                    \-----Beatrix De FAUCIGNY
|        |         /-----Henry PLANTAGENET, Earl Of Lancaster
|        |        |        |                                    /-----Louis VII The Young King Of France
|        |        |        |                           /-----Philip II Augustus King Of France
|        |        |        |                          |         \-----Alix Of Champagne
|        |        |        |                  /-----Louis VIII The Lion King Of France
|        |        |        |                 |        |         /-----Baldwin V Count Of Hainaut And Namur
|        |        |        |                 |         \-----Isabella Of Hainaut, Countess Of Artois
|        |        |        |                 |                  \-----Margarite Of Lorraine, Heiress Of Flanders
|        |        |        |         /-----Robert Count Of Artois
|        |        |        |        |        |                  /-----Sancho III King Of Castile
|        |        |        |        |        |         /-----Alfonso VIII The Good King Of Castile
|        |        |        |        |        |        |         \-----Blanche Of Navarre
|        |        |        |        |         \-----Blanche Of Castile
|        |        |        |        |                 |         /-----Henry II Curt Mantel PLANTAGENET, King Of England
|        |        |        |        |                  \-----Eleanor Of England
|        |        |        |        |                           \-----Eleanor Duchess Of Aquitaine
|        |        |         \-----Blanche Of Artois
|        |        |                 |                           /-----Godfrey III Count Of Louvain
|        |        |                 |                  /-----Henry I The Warrior Duke Of Brabant
|        |        |                 |                 |         \-----Margaret Von LIMBOURG
|        |        |                 |         /-----Henry II The Conqueror Duke Of Brabant
|        |        |                 |        |        |         /-----Matthew Of Alsace, Count Of Boulogne
|        |        |                 |        |         \-----Maud Of Boulogne
|        |        |                 |        |                  \-----Mary Countess Of Mortagne And Boulogne
|        |        |                  \-----Matilda Of Brabant
|        |        |                          |                  /-----Frederick III Barbarossa Duke Of Swabia, Emperor
|        |        |                          |         /-----Philip II Duke Of Swabia
|        |        |                          |        |         \-----Beatrix Of Macon, Countess Of Burgundy
|        |        |                           \-----Marie Of Swabia
|        |        |                                   |         /-----Isaac II Angelus, Eastern Roman Emperor
|        |        |                                    \-----Irene Angelica
|        |        |                                             \-----Irene
|         \-----Mary PLANTAGENET
|                 |                                             /-----Pagan De MONTDUBLEAU De CHAWORTH, Baron Of Kem
|                 |                                    /-----Patrick De CHAWORTH, Baron Of Kempsford
|                 |                           /-----Pain De CHAWORTH, Baron Of Kempsford
|                 |                          |         \-----Agnes
|                 |                  /-----Patric De CHAWORTH, Baron Of Kempsford
|                 |                 |        |         /-----Sir William De La FERTE
|                 |                 |         \-----Gundreda De La FERTE
|                 |                 |                 |         /-----Sir William De BRIWERE, Baron Of Horsley
|                 |                 |                  \-----Margaret De BRIWERE
|                 |                 |                           \-----Beatrice De VALLE
|                 |         /-----Sir Patric CHAWORTH, Baron Of Kempsford
|                 |        |        |                           /-----Simon De LONDRES
|                 |        |        |                  /-----Sir William De LONDRES
|                 |        |        |                 |         \-----Sibilla
|                 |        |        |         /-----Thomas De LONDRES, Lord Of Kidwelly
|                 |        |         \-----Hawise De LONDRES
|                 |        |                 |                  /-----Fulk FITZ WARIN
|                 |        |                 |         /-----Fulk FITZ WARIN
|                 |        |                 |        |         \-----Eva
|                 |        |                  \-----Eve FITZ WARIN
|                 |        |                          |         /-----Josselin De DINHAM
|                 |        |                           \-----Hawise De DINAN
|                  \-----Maud CHAWORTH
|                          |                                    /-----William De BEAUCHAMP, Baron Of Salwarpe
|                          |                           /-----Walter De BEAUCHAMP
|                          |                          |         \-----Joan De St VALERIE
|                          |                  /-----William BEAUCHAMP, Baron Of Elmsley Castle
|                          |                 |        |         /-----Roger De MORTIMER, Baron Of Wigmore
|                          |                 |         \-----Joan MORTIMER
|                          |                 |                  \-----Isabel De FERRIERS
|                          |         /-----William De BEAUCHAMP, Earl Of Warwick
|                          |        |        |                  /-----Robert MAUDIT, Baron Of Hanslope
|                          |        |        |         /-----William IV MAUDIT, Baron Of Hanslope
|                          |        |        |        |         \-----Isabel BASSET
|                          |        |         \-----Isabel MAUDUIT
|                          |        |                 |         /-----Waleran Beaumont De Newbourge, Earl Of Warwick
|                          |        |                  \-----Alice De NEWBOURGE
|                          |        |                           \-----Alice De Harcourt
|                           \-----Isabel De BEAUCHAMP
|                                   |                           /-----Piers De LUTEGARESHALE
|                                   |                  /-----Geoffrey FITZ PIERS, Earl Of Essex
|                                   |                 |         \-----Maud
|                                   |         /-----Sir John FITZ GEOFFREY
|                                   |        |        |         /-----Roger De CLARE, Earl Of Hertford
|                                   |        |         \-----Aveline De CLARE
|                                   |        |                  \-----Maud St. HILLARY
|                                    \-----Maud FITZJOHN
|                                            |                  /-----Roger BIGOD, Earl Of Norfolk, MC Surety
|                                            |         /-----Hugh BIGOD, Earl Of Norfolk, MC Surety
|                                            |        |         \-----Ida Countess Of Norfolk
|                                             \-----Isabel BIGOD
|                                                     |         /-----Sir William MARSHALL, Protector, Earl Of Pembroke
|                                                      \-----Maud MARSHALL
|                                                               \-----Isabel De CLARE, Countess Of Pembroke
Sir Thomas De PERCY



Descendants of Sir Thomas De PERCY
1. Sir Thomas De PERCY