Events
Date of Birth: unknown.
Place of Birth: unknown.
Bartrum (Bleddyn ap Cynfyn 24) gives Iorwerth a number of 5 in his generational dating system, implying a birth date of, very roughly, about 1170.
Date of Death: unknown.
Place of Death: unknown.
Relationships
Father: Owain Brogyntyn ap Madog ap Maredudd.
This relationship is shown by Bartrum (Bleddyn ap Cynfyn 24) and by given by Pierce.
Mother: uncertain.
It is unclear which of Owain’s wives was the mother of his sons.
Spouse: Efa ferch Madog ap Gwenwynwyn.
This relationship is shown by Bartrum (Bleddyn ap Cynfyn 24).
Children (by Efa):
(Complete source citations for facts about the children on this page are currently outside of the scope of this project. Most information below comes from Bartrum.)
Elise married Annes ferch Dafydd.
Children (mother unknown):
Llywelyn Foel.
A daughter married Madog ab Iarddur.
Gruffudd married Gwenllian ferch Dafydd Goch.
References
Bartrum, Peter C., “Bleddyn ap Cynfyn 24” in An Electronic Version of Welsh Genealogies AD 300-1500.
[The sources that Bartrum cites for Iorwerth are: Peniarth 131 (72, 106), written by Gutun Owain about 1480; Peniarth 131 (281), written by Ieuan Brechfa about 1500; Peniarth 129 (58, 75), copied about 1500 from a 1497 MS by Gutun Owain; Peniarth 127 (25), written by Syr Thomas ap Ieuan ap Deicws between about 1510 and 1523.]
Pierce, Thomas Jones. “Owain Brogyntyn” in Welsh Biography Online.