Sybil verch Iestyn

Sybil verch Iestyn was born about 1076.  Sybil verch Iestyn's father was last Prince of Glamorgan, King of Morgannwg Iestyn ap Gwrgant and her mother is Gwenwyn verch Cyfan.  Her paternal grandparents are Prince of Powys Gwrgant ap Ithel and Gwladus verch Ednowen Bendew *. She has four brothers and a sister, named Rhodri ap Iestyn, Gruffydd ap Iestyn, Morgan Hir ap Iestyn, Hywel ap Iestyn and Gwenllian verch Iestyn.  She is the oldest of the six children. She has eleven half-brothers and two half-sisters, named Mareddud ap Iestyn, Cynfrig ap Iestyn, Cadogan ap Iestyn, Rhywallon ap Iestyn, Rhudlan ap Iestyn, Yoreth ap Iestyn, Meurig ap Iestyn, Caradog ap Iestyn, Rhys ap Iestyn, Morgan ap Iestyn, Madog ap Iestyn, Ellen verch Iestyn and Nesta verch Iestyn.