Rhiwallon ap Cynfyn, Prince of Powys

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Rhiwallon ap Cynfyn

Birthplace: Powys, Wales
Death: 1069 (44-45)
Montgomeryshire, Powys, Wales (Killed in Battle of Mechain by the sons of Gruffudd ap Llewelyn)
Immediate Family:

Son of Cynfyn ap Gwerystan, arglwydd of Cwybr and Angharad verch Maredudd
Husband of N.N. 1 verch Hywel
Father of Meilir ap Rhiwallon; Rhirid ap Rhiwallon; Sioned verch Rhiwallon and Gwladys verch Rhiwallon, Queen of Deheubarth
Brother of Bleddyn ap Cynfyn, King of Powys; Gwenwyn verch Cynfyn and Llewelyn ap Cynfyn
Half brother of N.N. ferch Cynfyn; Efa verch Cynfyn; Nest verch Cynfyn; Iwerydd verch Cynfyn; Ifor ap Gwyn and 1 other

Occupation: Killed At Battle Of Mechain; http://homepages.rootsweb.ancestry.com/~gwinslow/Thornton/wga6.html#I579
Managed by: James Fred Patin, Jr.
Last Updated:

About Rhiwallon ap Cynfyn, Prince of Powys

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6516/TABLES%20-%20EARLY%20SERIES_47.png?sequence=8&isAllowed=y (May 31, 2018; Anne Brannen, curator)

Please see Darrell Wolcott: The Clan of Tudor Trevor; http://www.ancientwalesstudies.org/id55.html. Footnote # 15. (Steven Ferry, May 4, 2017.)

Please see Darrell Wolcott: Cynfyn ap Gwerystan, the Interim King; http://www.ancientwalesstudies.org/id209.html. (Steven Ferry, June 1, 2017.)

Please see Darrell Wolcott: The Consorts and Children of Gruffudd ap Llewelyn; http://www.ancientwalesstudies.org/id210.html. (Steven Ferry, June 3, 21017.)

Please see Darrell Wolcott: Owain ap Cadwgan and Nest ferch Rhys-an Historic Fiction?; http://www.ancientwalesstudies.org/id160.html. (Steven Ferry, June 12, 2017.)

Please see Darrell Wolcott: Minimum Age for Welsh Kingship in the 11th Century; http://www.ancientwalesstudies.org/id45.html. (Steven Ferry, October 5, 2019.)

Please see Darrell Wolcott: The Royal Family of Powys - Nest ferch Cadell ap Brochwel; http://www.ancientwalesstudies.org/id12.html. (Steven Ferry, October 13, 2019.)

Please see Darrell Wolcott: The Royal Family of Powys - End of the Powys Dynasty; http://www.ancientwalesstudies.org/id14.html. (Steven Ferry, October 18, 2019.)

Please see Darrell Wolcott: The Royal Family of Powys - Powys Dynastic Family 945-1385; http://www.ancientwalesstudies.org/id20.html. (Steven Ferry, October 19, 2019.)

Please see Darrell Wolcott: The Royal Family of Gwynedd - The Unofficial "History" of Gruffudd, Nephew of Iago; http://www.ancientwalesstudies.org/id74.html. (Steven Ferry, December 4, 2019.)

Please see Darrell Wolcott: The Shropshire Walcot Family - Chart II: Second Powys Dynasty; http://www.ancientwalesstudies.org/id99.html. (Steven Ferry, May 14, 2020.)

Please see Darrell Wolcott: The Shropshire Walcot Family- Chart III: First Powys Dynasty; http://www.ancientwalesstudies.org/id98.html. (Steven Ferry, May 17, 2020.)

Please see Darrell Wolcott: The Battle of Mynydd Carn; http://www.ancientwalesstudies.org/id35.html. (Steven Ferry, May 26, 2020.)

  • Rhiwallon ap Cynfyn

born about 1025 Powys, Wales died 1070 (slain) Battle of Mechain, Montgomeryshire, Wales


  • Cynfyn ap Gwerystan King of Powys

born about 1002 Powys, Wales


  • Angharad verch Maredydd

born about 0982 Deheubarth, Wales married 1023


  • Bleddyn ap Cynfyn born about 1025 Montgomeryshire, Wales died 1075
  • Miss verch Cynfyn born about 1024 Powys, Wales
  • Iwerydd verch Cynfyn born about 1024 Powys, Wales
  • Nest verch Cynfyn born about 1027 Powys, Wales

Gwerydd verch Cynfyn

spouse: unknown


  • Sioned (Jonet) verch Rhiwallon born about 1037? Powys, Wales
  • Gwladys verch Rhiwallon born about 1041 Powys, Wales

biographical and/or anecdotal:

notes or source: ancestry.com

The Battle of Mechain was fought in 1070 in Montgomeryshire, Wales, for rule of the Welsh kingdoms of Gwynedd and Powys.

After the murder of Gruffydd ap Llywelyn, Harold Godwinson married his widow Ealdgyth and divided Gruffydd's realm into the traditional kingdoms of Gwynedd and Powys, the rule of which were given to Bleddyn ap Cynfyn and his brother Rhiwallon ap Cynfyn. Gruffydd left two sons who in 1070 challenged Bleddyn and Rhiwallon at Mechain in an attempt to win back part of their father's kingdom. However, both of Gruffyd's sons were defeated, one being killed and the other dying of exposure after the battle.

Rhiwallon was also killed in this battle, leaving Bleddyn to rule Gwynedd and Powys alone.


Rhiwallon Ap Cynfyn became co-ruler of Gwynedd, Wales in 1063. He died in the Battle of Mechain.

A descendant of one branch of Rhodri The Great, he was a member of the House of Dinefwr. He ruled the Kingdoms of Gwynedd & Powys jointly with his brother, Bleddyn ap Cynfyn, as King of Deheubarth until his death in 1093 in the Battle of MeChain at the age of 45. His brother then ruled alone.

In August 1067, Rhiwallon and Bleddyn joined Eadric the Wild in an attack upon Herefordshire as part of the Saxon resistance to the recent Norman Conquest of England. In 1069 or 1070, the two brothers fought the battle of Battle of Mechain against Gruffydd's sons Maredudd and Idwal. Though victorious, Rhiwallon was slain in battle and left Bleddyn sole prince of North Wales.

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