Iorwerth ab Owain of Gwynedd
- Born: 1130, Aberffraw Castle, Aberffraw, Anglesey, Caernarvonshire, Wales
- Marriage (1): Marared ferch Madog in 1163 in Aberffraw, Anglesey, Wales
- Died: 1174, Pennant Melangell, Powys, Montgomery, Wales aged 44
- Buried: 1174, Pennant Melangell, Powys, Montgomery, Wales
FamilySearch ID: 9ZH7-FWJ.
Iorwerth married Marared ferch Madog, daughter of Madog ap Maredudd and Susanna ferch Gruffydd, in 1163 in Aberffraw, Anglesey, Wales. (Marared ferch Madog was born about 1129 in Aberffraw, Anglesey, Wales and died on 12 May 1189 in Aberffraw, Anglesey, Wales.)
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