Llewelyn "Fawr" Iowerth

Abt 1173 - 1240  (67 years)

• Name	Llewelyn "Fawr" Iowerth
  Birth	Abt 1173	, Anglesey, Wales
  Gender	Male
  Nickname	Fawr
  Name	Fawr Iowerth  [1, 2, 3, 4, 5, 6, 7, 8]
  Death	11 Apr 1240	Aberconway, Carnarvon, , WLS
  Burial	Aberconway, Carnarvon, , WLS   [3]
  Person ID	I11554	Ancestrees
  Last Modified	3 Mar 2026

  
  

  Father	Iowerth "Drwyndwn" Ap Owain Gwynedd,   b. Abt 1140   d. Yes, date unknown
  Relationship	natural
  Mother	Margaret Vz Madog Ap Maredudd Ap Bleddyn Ap Cynfyn
  Relationship	natural
  _MARRIED	N
  Family ID	F258	Group Sheet  |  Family Chart

  
  

  Family 1	Joan (Joanna) Of England,   b. 1191   d. 2 Feb 1237, Llyn Eglwystl, , , WLS (Age 46 years)
  Marriage	1204
  Children	1. David Llewellyn, Prince Of Wales,   b. 1208   d. 1246 (Age 38 years)  [Father: natural]  [Mother: natural]   2. Angharad Ferch Llewelyn,   b. Aft 1204   d. Yes, date unknown  [Father: natural]  [Mother: natural]   3. Elen or Helen Ferch Llewellyn, Princess Of N.Wales,   b. Abt 1207   d. 1253 (Age 46 years)  [Father: natural]  [Mother: natural]   4. Marared Ferch Llewelyn   d. 1263  [Father: natural]  [Mother: natural]   5. Gwladys "Ddu" Ferch Llewelyn   d. 1240  [Father: natural]  [Mother: natural]
  Family ID	F3471	Group Sheet  |  Family Chart
  Last Modified	3 Mar 2026

  
  

  Family 2	Tangwystl Goch Ferch Llywarch,   b. 1165
  _MARRIED	N
  Children	1. Gruffydd Ap Llywelyn Ab Iorwerth,   b. 1196   d. 1244 (Age 48 years)  [Father: natural]  [Mother: natural]
  Family ID	F3472	Group Sheet  |  Family Chart
  Last Modified	3 Mar 2026

  
  

• Notes

  Iorwerth Llwewlelyn "Fawr", Prince of Wales, is sometimes listed as being married to Joan Plantaganet and other times listed as Joan of England. It is a matter of English history that he was married to Joan, the illegitimate daughter of Khn. I have only found her name listed as Joan Plantaganet in CD-100, elsewhere being referred to as Joan of England. She has an estimated birth date of 1178 in CD-100. This would mean her father, John Lackland was only 12 when she was born. Joan was Llwewlelyn's only wife. He did have a mistress and one son before marrying Joan. I found his wife's mother in a biography entitled "King John" by W. L. Warren. She came from the union of King John and Clementina (who was supposedly low born) before John's second marriage and probably during his first marriage without heirs to his second cousin, Isabelle, daughter of the Earl of Gloucester in 1189. Their marriage was annulled due to the fact that the church had never approved of the second cousin relationship and he had no rightful heirs. Do not confuse this Iowerth's wife, Joan of England, with John's legitimate daughter also named Joan. She was born July 22, 1210 (C-433, 567) It was common at the time for a ruler to name his illegitimate and legitimate children the same names. He had two son Richards and two daughters named Joan. UA #2337. King John specifically arranged for Iowerth to marry his illegitimate daughter , Joan, to help ensure an alliance with what would have been a very powerful enemy. Iowerth was the first person to unite most of Wales. He was a formidable enemy to King John but became an ally to the king when he married his daughter for a few years following. Iorwerth was known as Llywellyn "the Great".

  
  

• Sources

  [S2973] Sierra, Email dated 2002 from sierrasgenealogy@yahoo.com. [S2974] Barry, Jim, Email dated 2011 from JIMBARRY1946@aol.com. [S206] United Ancestries Linked Pedigrees CD 100 (Automated Archives). [S123] CD 102 (Automated Archives). [S376] Francis Jones, Wales Herald Extraordinary, The Princes and Principality of Wales (Cardiff: University of Wales Press, c1969). [S2975] C.P. Collins, Royal Anc./Magna Carta. [S120] A.D. Carr, Owen of Wales: The End of the House of Gwynedd (University of Wales Press). [S214] W.L. Warren, King John (London, England; Eyre & Spottiswoode Pub.).