Genealogy of the Marshall Family,
including Medieval and Ancient Lines

Updated: 09-30-2024.

Submitted and Maintained by Bill Marshall, bill.marshall@verizon.net.


Additions and corrections appreciated (especially with sources). My current list of sources is here. Homepage here.

Index of Medieval and Ancient Lines is here, notable people here, and Gedcom available to be downloaded.

Index of Modern Lines (immigrants to America and their descendants) is here, notable people here, and Gedcom here.


Individual Page


Family:
Marriage:
Bibliography
  1. Richardson, Douglas, Wives of Llewelyn. Posting to soc.genealogy.medieval (email list GEN-MEDIEVAL) on 10/14/1999. Subject: Llewelyn's wives - a summary. Available at https://groups.google.com/g/soc.genealogy.medieval/c/zxercknevKQ/m/vjqk9ynIqWgJ. Author address: royalancestry at msn dot com. Information from this source tagged as [Ref: Douglas Richardson SGM 10/14/1999].
  2. Reitwiesner, William Addams, The Children of Joan, Princess of North Wales, The Genealogist (APSG), vol 1 no 1 (1981), p80-95. NYPL APA 82-1000. Available at https://www.americanancestors.org/databases/genealogist-the/image/. Information from this source tagged as [Ref: Reitwiesner Joan 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 v5p[0-9]*].

Sources for birth and parent Information
parents:
[Ref: Douglas Richardson SGM 10/14/1999],
father:
[Ref: Reitwiesner Joan p84, Richardson RoyalAnc v5p298],
brother:
Llywellyn's bastard son, Griffith [Ref: Douglas Richardson SGM 10/14/1999]
Sources for death Information
date:
[Ref: Reitwiesner Joan p84]
Sources with Information about marriage to William De LACY
names:
[Ref: Reitwiesner Joan p84, Richardson RoyalAnc v5p298]
Research Notes:
mentioned in a contemporary letter to King Henry III of England in which she was plainly identified as the sister of Llywellyn's bastard son, Griffith. The implication of the letter is that Griffith and Gwenllian were full siblings. If correct, then Gwenllian's mother would be Tangwystal, Llywelyn's known mistress, who as I recall was Griffith's mother. Gwenllian was definitely not the daughter of Lllywelyn's wife, Joan, otherwise the letter would have referred to Gwenllian as King Henry III's own niece (Joan being the sister of King Henry III). [Ref: Douglas Richardson SGM 10/14/1999]



Pedigree of Gwenllian Las
                                                                /-----Meyric Prince Of North Wales
                                                       /-----Idwal Prince Of North Wales
                                              /-----Iago Ab Idwal, Prince Of Gwynedd
                                     /-----Cynan Ap Iago, Prince Of North Wales
                            /-----Gruffydd Ap Cynan, Prince Of Gwynedd
                           |        |                           /-----Olaf III Sihtricsson, King Of Yorks And Dublin
                           |        |                  /-----Sihtric III Of The Silken Beard OLAFSON, King Of Dublin
                           |        |                 |         \-----Gormflaith Of Nass
                           |        |         /-----Olaf Of Dublin
                           |        |        |        |         /-----Brian Boruma, King Of Cashel And Munster, High
                           |        |        |         \-----Slani
                           |        |        |                  \-----Echrad
                           |         \-----Ragnaillt Of Dublin
                           |                 |                  /-----Tuathal Ui DUNLAINGE, King Of Laigin & Leinster
                           |                 |         /-----Dunlang Ui DUNLAINGE, King Of Laigin & Leinster
                           |                  \-----Maelcorcre Of Leinster
                   /-----Owain Gwynedd Prince Of Gwynedd
                  |        |                  /-----Edwin Ap Gronwy Of Tegeingl
                  |        |         /-----Owain Ap Edwin
                  |        |        |        |                  /-----Gwerystan
                  |        |        |        |         /-----Cynfyn Ap Gwerystan
                  |        |        |         \-----Iwerydd Ferch Cynfyn
                  |         \-----Angharat Of Tegaingl
                  |                 |         /-----Ednywain Bendew I Ap Neinad
                  |                  \-----Morwyl Ferch Ednywain Bendew
          /-----Iorworth Drwyndwn Prince Of Gwynedd
         |        |                           /-----Caradog
         |        |                  /-----Trahaern Of Arwystil, King Of Gwynedd
         |        |         /-----Llywarch
         |         \-----Gladys Ferch Llywarch
         |                  \-----Dyddgu Of Builth
 /-----Llewellyn Fawr The Great AP IORWORTH, Prince Of North Wales
|        |                                             /-----Gwerystan
|        |                                    /-----Cynfyn Ap Gwerystan
|        |                           /-----Bleddyn Ap Cynfyn, King Of Gwynedd And Powys
|        |                          |        |                  /-----Owain Ap Hywel, Prince Of Deheubarth
|        |                          |        |         /-----Maredudd Ab Owain, Prince Of Deheubarth
|        |                          |        |        |         \-----Angharad Ferch Llywelyn
|        |                          |         \-----Angharad Ferch Maredudd
|        |                  /-----Maredudd Ap Bleddyn
|        |                 |        |         /-----Cillin Y Blaidd Rhudd
|        |                 |         \-----Haer Ferch Cillin
|        |         /-----Madog Ap Maredudd, Prince Of Powys Fadog
|        |        |        |         /-----Einudd
|        |        |         \-----Hunydd Ferch Einudd
|         \-----Margred Ferch Madog
|                 |                                             /-----Meyric Prince Of North Wales
|                 |                                    /-----Idwal Prince Of North Wales
|                 |                           /-----Iago Ab Idwal, Prince Of Gwynedd
|                 |                  /-----Cynan Ap Iago, Prince Of North Wales
|                 |         /-----Gruffydd Ap Cynan, Prince Of Gwynedd
|                 |        |        |                           /-----Olaf III Sihtricsson, King Of Yorks And Dublin
|                 |        |        |                  /-----Sihtric III Of The Silken Beard OLAFSON, King Of Dublin
|                 |        |        |                 |         \-----Gormflaith Of Nass
|                 |        |        |         /-----Olaf Of Dublin
|                 |        |        |        |        |         /-----Brian Boruma, King Of Cashel And Munster, High
|                 |        |        |        |         \-----Slani
|                 |        |        |        |                  \-----Echrad
|                 |        |         \-----Ragnaillt Of Dublin
|                 |        |                 |                  /-----Tuathal Ui DUNLAINGE, King Of Laigin & Leinster
|                 |        |                 |         /-----Dunlang Ui DUNLAINGE, King Of Laigin & Leinster
|                 |        |                  \-----Maelcorcre Of Leinster
|                  \-----Susanna Ferch Gruffudd Ap Cynan
|                          |                  /-----Edwin Ap Gronwy Of Tegeingl
|                          |         /-----Owain Ap Edwin
|                          |        |        |                  /-----Gwerystan
|                          |        |        |         /-----Cynfyn Ap Gwerystan
|                          |        |         \-----Iwerydd Ferch Cynfyn
|                           \-----Angharat Of Tegaingl
|                                   |         /-----Ednywain Bendew I Ap Neinad
|                                    \-----Morwyl Ferch Ednywain Bendew
Gwenllian Las
|         /-----Llywarch Goch
 \-----Tangwystl Of Rhos



Descendants of Gwenllian Las
1. Gwenllian Las m. William De LACY
m. William De LACY father: Hugh De LACY, Lord Of Stanton Lacy mother: Rose O'CONNOR