Gruffydd AP CYNAN, King of Gwynedd
(Abt 1055-1137)
Angharad FERCH OWAIN of Deheubarth
(Abt 1070-Abt 1129)
Dyddgu FERCH IORWERTH of Builth
(Abt 1060-)
Owain AP GRUFFYDD, King of Gwynedd
(Abt 1100-1169)
(Abt 1098-Bef 1155)
Iorwerth "Drynndwn" AB OWAIN, Prince of Gwynedd


Family Links

Marared FERCH MADOG of Powys

Iorwerth "Drynndwn" (Flat-Nosed) AB OWAIN, Prince of Gwynedd

  • Married:
  • Died: 1174

  Research Notes:

His parentage is confirmed by the Annales Cambriæ which name his son "Lewelinus filius Gervasii filii Owini Guynet…princeps Walliæ".

He succeeded his father in 1170 as IORWERTH Prince of Gwynedd. 1


In the partition of his father's territories he received Arfon and probably Nanconwy. Shortly afterwards he disappears from view, probably dying about the time of the usurpation of power in Upper Gwynedd by his half-brother, David I, in 1174. 2

  Marriage Information:

Iorwerth married Marared FERCH MADOG of Powys, daughter of Madog AP MAREDYDD and Susanna FERCH GRUFFYDD.


1 Foundation for Medieval Genealogy, Medlands: Iorwerth "Drwyndwyn/flat nose".

2 Dictionary of Welsh Biography, Iorwerth Drwyndwn (The Flat-Nosed) (d. probably c. 1174).

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