Iestyn ab Gwrgant
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Iestyn ap Gwrgant was the last ruler of the Welsh kingdom of Morgannwg, which encompassed the pre-1974 counties of Glamorgan and Monmouthshire. He was deposed in circa 1090 by the Norman Robert Fitzhamon, lord of Gloucester who established a lordship based in Cardiff and subsequently conquered the low-land part of Glamorgan (the Vale of Glamorgan) which was parcelled out to his followers. The mountainous parts (the valleys) were left in Welsh control. It is said that Iestyn, following a dispute with his rival, Einion ap Collwyn, invited Fitzhamon and his "twelve knights" into the region to settle the matter; naturally, they refused to leave.
Caradog, the eldest son of Iestyn ap Gwrgant, was the only Welsh lord to retain lands in the low-land, retaining the land between the River Neath and River Afan rivers, where himself and his descendants were known as the lords of Afan.
Iestyn ap Gwrgant was the last ruler of the royal house of Morgannwg which had a lineage stretching back over five centuries to Tewdrig (circa 550 - 584). This royal house had links to the other royal houses of Wales through marriage and were descendants of the celebrated Rhodri Mawr. It is believed Iestyn ap Gwrgant's base was at Dinas Powis, south of Cardiff.