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Male Iorwerth Drwyndwn ap Owain Gwynedd Click to view Iorwerth Drwyndwn ap Owain Gwynedd in the family tree

Iorwerth Drwyndwn was born in Aberffraw Castle, Aberffraw, Anglesey, Wales.1   Iorwerth Drwyndwn's father was Owain Fawr ap Gruffydd Prince of Gwynedd and his mother was Gwladys verch Llywarch.  His paternal grandparents were Gruffydd ap Cynan Prince of Gwynedd and Angharad verch Owain; his maternal grandparents were Llywarch ap Trahaern Lord Pembroke and Dyddgu verch Iorwerth. He had a half-sister named Angharad.  He died  due to Killed fighting his brothers Dafydd & Rhodri for crown of Gwynedd. in Pennant Mehangell.1 

Family Details of Iorwerth Drwyndwn's family with Marared verch Madoc

1 large-G675.FTW
Further sources/citations:
University of Hull Royal Database (England), Royal Genealogies DB, Ancestral Roots of Certain American Colonists Who Came to America bef 1760 @ line 176 p 151, large-G675.FTW

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