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Male Iowerth ("Drwyndwn") ap Owain Gwynned Click to view Iowerth ("Drwyndwn") ap Owain Gwynned in the family tree

Iowerth, known as "Drwyndwn", was born in 1145 in Aberffraw Castle, Caernarvonshire, Wales.  "Drwyndwn"'s father was Prince Owain ("Gwynedd") ap Gruffydd of North Wales and his mother is Gladys verch Llywarch.  His paternal grandparents were King Gruffydd ap Cynan of Gwynedd and Angharad verch Owain; his maternal grandfather was Llywarch ap Trahaearn and his maternal grandmother is Dyddgu verch Iorwerth. He had a sister named Gwenllian.  He was the younger of the two children. He had two half-sisters named Gwenllian and Angharad.  Iowerth, known as "Drwyndwn", is no longer alive.


"Drwyndwn"'s family with Margaret ferch Madog

‌"Drwyndwn" and Margaret were married in a religious ceremony about 1163.  They had a son named "the Great".

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