Events
Date of Birth: unknown.
Place of Birth: unknown.
Bartrum gives Iorwerth a number of 3 in his generational dating system, implying a birth date of, very roughly, about 1100.
Date of Death: unknown.
Place of Death: unknown.
Relationships
Father: Gwgon ab Idnerth ab Edryd.
Iorwerth and his ancestors are mentioned in the 1334 Survey of Denbighshire (lv, p. 228, p. 261, p. 265, p. 297, and p. 303). This relationship is shown by Bartrum (Marchudd 3).
Mother: unknown.
Spouse: Gwenllian ferch Rhirid.
This relationship is shown by Bartrum (Marchudd 3).
Children:
(Complete source citations for facts about the children on this page are currently outside of the scope of this project.)
Cynwrig married Angharad ferch Hwfa.
References
Bartrum, Peter C., “Marchudd 3” in An Electronic Version of Welsh Genealogies AD 300-1500.
Guy, Ben. Medieval Welsh Genealogy. (The Boydell Press, 2020).
From Guy’s critical edition of the Llywelyn ab Iorwerth genealogies, which were based on an archetype created no later than the first half of the fourteenth century from an original compilation dating to the early thirteenth century, partly based on earlier written sources (Note that Guy is striving for textual rather than genealogical accuracy):
54 Gwyr Ros Nerfynyawn. Pedwar gwely llwyth Edryt.
54.1 Ednyfet Vychan m. Kenwrik m. Ierwerth m. Gwgawn m. Idnerth mab Edryt m. Inethan.
Roberts, Glyn. “Wyrion Eden’: The Anglesey Descendants of Ednyfed Fychan in the Fourteenth Century” in Aspects of Welsh History. (University of Wales Press, 1969).
Survey of the Honour of Denbigh 1334 (Paul Vinogradoff and Frank Morgan eds.) (British Academy, 1914).