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Male Madog ap Iestyn Click to view Madog ap Iestyn in the family tree

Madog ap Iestyn was born about 1100 in Rhuthin Manor,St Mary Hill,Glamorganshire,Wales.  Madog ap Iestyn's father was last Prince of Glamorgan, King of Morgannwg Iestyn ap Gwrgant and his mother is Constance Wen verch Cadwgan.  His paternal grandparents are Prince of Powys Gwrgant ap Ithel and Gwladus verch Ednowen Bendew *; his maternal grandfather was Lord of Melienydd Cadwgan ap Elystan and his maternal grandmother is Efa verch Gwrgant. He has three brothers and a sister, named Caradog ap Iestyn, Rhys ap Iestyn, Morgan ap Iestyn and Nesta verch Iestyn.  He is the youngest of the five children. He has eleven half-brothers and three half-sisters, named Rhodri ap Iestyn, Gruffydd ap Iestyn, Morgan Hir ap Iestyn, Hywel ap Iestyn, Mareddud ap Iestyn, Cynfrig ap Iestyn, Cadogan ap Iestyn, Rhywallon ap Iestyn, Rhudlan ap Iestyn, Yoreth ap Iestyn, Meurig ap Iestyn, Sybil verch Iestyn, Gwenllian verch Iestyn and Ellen verch Iestyn.


Madog ap Iestyn's family with Jonet verch Ynyr

‌Madog ap Iestyn and Jonet verch Ynyr were married in a religious ceremony about 1139.  They have a son named Hywel ap Madog.

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