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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 04 Dacre-Dysart. London: St Catherine Press, 1916. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Vol 4 also available at http://archive.org/completepeerageo04byucoka Information from this source tagged as [Ref: CP IV [Ap][p0-9].*].

Sources for birth and parent Information
father:
[Ref: CP IV p199]
Sources for death Information
date:
[Ref: CP IV p199]
Research Notes:
d.s.p [Ref: CP IV p199]



Pedigree of William De MORTIMER
                                                                /-----Hugh De MORTIMER, Baron Of Wigmore
                                                       /-----Hugh De MORTIMER, Baron Of Wigmore
                                              /-----Roger De MORTIMER, Baron Of Wigmore
                                             |        |         /-----William De MESCHINES, Baron Of Egremont
                                             |         \-----Maud De MESCHINES
                                             |                  \-----Cecily De ROMILLY
                                     /-----Ralph MORTIMER, Baron Of Wigmore
                                    |        |                  /-----Henry De FERRERS
                                    |        |         /-----Walkeline FERRERS, Lord Of Oakham
                                    |         \-----Isabel De FERRIERS
                            /-----Hugh De MORTIMER, Lord of Chelmarsh
                           |        |                           /-----Owain Gwynedd Prince Of Gwynedd
                           |        |                  /-----Iorworth Drwyndwn Prince Of Gwynedd
                           |        |                 |         \-----Gladys Ferch Llywarch
                           |        |         /-----Llewellyn Fawr The Great AP IORWORTH, Prince Of North Wales
                           |        |        |        |         /-----Madog Ap Maredudd, Prince Of Powys Fadog
                           |        |        |         \-----Margred Ferch Madog
                           |        |        |                  \-----Susanna Ferch Gruffudd Ap Cynan
                           |         \-----Gladys DHU
                           |                 |         /-----Llywarch Goch
                           |                  \-----Tangwystl Of Rhos
                   /-----Henry De MORTIMER
                  |        |                                    /-----Robert De FERRERS, Earl Of Derby
                  |        |                           /-----William FERRERS, Earl Of Derby
                  |        |                          |         \-----Margaret PEVERIL
                  |        |                  /-----William De FERRERS, Earl Of Derby
                  |        |                 |        |         /-----William De BRAOS, Baron Of Bramber
                  |        |                 |         \-----Sibyl De BRAOISE
                  |        |                 |                  \-----Bertha Of Hereford
                  |        |         /-----William De FERRERS, Earl Of Derby
                  |        |        |        |                  /-----Ranulf De GERNON, Earl Of Chester, Vicomte D'Avranches
                  |        |        |        |         /-----Hugh Of Kevelioc, Earl Of Chester
                  |        |        |        |        |         \-----Maud De CAEN
                  |        |        |         \-----Agnes Of Chester, Lady Of Chartley
                  |        |        |                 |         /-----Simon De MONTFORT, Count Of Evreux
                  |        |        |                  \-----Bertrade De MONTFORT
                  |        |        |                           \-----Maud
                  |         \-----Agatha De FERRERS
                  |                 |                           /-----Gilbert GIFFARD, Marshal
                  |                 |                  /-----John Fitz GILBERT The Marshal
                  |                 |                 |         \-----(Unk dau) De VENOIZ
                  |                 |         /-----Sir William MARSHALL, Protector, Earl Of Pembroke
                  |                 |        |        |         /-----Walter De SALISBURY, Baron Of Chitterne
                  |                 |        |         \-----Sibyl De SALISBURY
                  |                 |        |                  \-----Sibyl De CHAWORTH
                  |                  \-----Sibyl MARSHALL
                  |                          |                  /-----Gilbert De CLARE, Earl Of Pembroke
                  |                          |         /-----Richard "Strongbow" De CLARE, Earl Of Pembroke
                  |                          |        |         \-----Elizabeth De BEAUMONT
                  |                           \-----Isabel De CLARE, Countess Of Pembroke
                  |                                   |         /-----Dairmait Mac MURCHAD, King Of Leinster
                  |                                    \-----Aoife Macmurchada Of Leinster
                  |                                             \-----Mor Ua TUATHAIL
          /-----Hugh De MORTIMER
 /-----Henry De MORTIMER
William De MORTIMER



Descendants of William De MORTIMER
1. William De MORTIMER