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Family:
Bibliography
  1. Barrett, Jonathan Tyers, Memorials of the parochial church, the collegiate chantry, and the chapel of St. Mary: commonly called Mortimer's Chapel, in the Parish of Attleborough, in the county of Norfolk, together with some account of the services used at the consecration of churches from the Anglo-Saxon to the present time, London: John W Parker, 1848. Available at https://archive.org/details/memorialsofparoc00barr. Also available at https://books.google.com/books?id=s0IIAAAAQAAJ. Information from this source tagged as [Ref: Barrett Attleborough p[0-9]*].
  2. Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, vol 09, Moels-Nugent. London: St Catherine Press, 1936. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Information from this source tagged as [Ref: CP IX [Ap][p0-9].*].

Sources for birth and parent Information
date:
second son [Ref: CP IX p250(k)],
parents:
[Ref: Barrett Attleborough p188, CP IX p250(k)]
Research Notes:



Pedigree of Constantine De MORTIMER
                                                                /-----William De MORTIMER
                                                       /-----Robert De MORTIMER
                                              /-----William De MORTIMER
                                             |        |         /-----Warin De MUNCHENSY
                                             |         \-----Alice De MUNCHESNEY
                                             |                  \-----Agnes FITZJOHN
                                     /-----Robert De MORTIMER
                            /-----William De MORTIMER
                   /-----Constantine De MORTIMER
                  |         \-----Alice
          /-----Sir Constantine De MORTIMER
         |        |                                             /-----William De BRAOS, Baron Of Bramber
         |        |                                    /-----William De BRAOS, Baron Of Bramber
         |        |                                   |         \-----Bertha Of Hereford
         |        |                           /-----William De BRAOSE, Lord Of Gower
         |        |                          |        |         /-----Bernard De St VALERY, Baron Of Beckley
         |        |                          |         \-----Matilda De ST VALERIE De HAIA
         |        |                          |                  \-----Matilda
         |        |                  /-----John De BRAOSE, Baron Of Bramber
         |        |                 |        |                  /-----Roger De CLARE, Earl Of Hertford
         |        |                 |        |         /-----Richard De CLARE, Earl Of Hertford, MC Surety
         |        |                 |        |        |         \-----Maud St. HILLARY
         |        |                 |         \-----Matilda DE CLARE
         |        |                 |                 |         /-----William Meullant FITZ ROBERT, Earl Of Gloucester
         |        |                 |                  \-----Amice MEULANT, Countess Of Gloucester
         |        |                 |                           \-----Hawise DeBEAUMONT
         |        |         /-----Sir Richard De BREUSE, Lord Of Stinton
         |        |        |        |                           /-----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
         |        |        |         \-----Margaret Of Wales
         |        |        |                 |                  /-----Henry II Curt Mantel PLANTAGENET, King Of England
         |        |        |                 |         /-----John Lackland PLANTAGENET, King Of England
         |        |        |                 |        |         \-----Eleanor Duchess Of Aquitaine
         |        |        |                  \-----Joan
         |        |        |                          |         /-----William FERRERS, Earl Of Derby
         |        |        |                           \-----Agatha De FERRERS
         |        |        |                                    \-----Sibyl De BRAOISE
         |         \-----Sibyl De BREUSE
         |                 |                                    /-----Ernald Le RUS
         |                 |                           /-----Ernald Le RUS
         |                 |                  /-----Hugh Le RUS
         |                 |                 |         \-----Isabel
         |                 |         /-----William Le RUS
         |                 |        |        |                  /-----Roger De HUNTINGFIELD, Lord Of East Bradenham
         |                 |        |        |         /-----Sir William De HUNTINGFIELD, MC Surety
         |                 |        |        |        |         \-----Alice De SENLIS
         |                 |        |         \-----Alice De HUNTINGFIELD
         |                 |        |                 |         /-----William De GRESSINGHALE
         |                 |        |                  \-----Isabel De GRESSINGHALE
         |                 |        |                           \-----Alina De WARENNE
         |                  \-----Alice Le RUS
         |                          |                           /-----Ralph De CLERE
         |                          |                  /-----Ralph II De CLERE
         |                          |                 |         \-----Mabel
         |                          |         /-----Roger De CLERE
         |                          |        |        |         /-----Peter FITZ HENRY
         |                          |        |         \-----Margaret
         |                          |        |                  \-----Isabel De CHESNEY
         |                           \-----Agatha De CLERE
         |                                   |                  /-----Ralph De FAY
         |                                   |         /-----Ralph De FAY
         |                                    \-----Maud De FAY
         |                                            |         /-----Stephen De TURNHAM
         |                                             \-----Beatrice De TURNHAM
         |                                                      \-----Edeline De BROC
 /-----Sir Robert De MORTIMER
|         \-----Agnes
Constantine De MORTIMER
 \-----Margery



Descendants of Constantine De MORTIMER
1. Constantine De MORTIMER