Career
Iestyn ap Gwrgant was the last ruler of the royal house of Morgannwg, which had a lineage stretching back over five centuries to Tewdrig (c 550–584). Iestyn ap Gwrgant"s base is believed to have been at Dinas Powis, south west of Cardiff. Iestyn probably ruled Morgannwg for a little less than a decade (c 1081–1090) and is believed to have built castles in the regions of Cardiff and Kenfig.
Naturally, once invited in, they refused to leave.
The mountainous parts of Glamorgan were left in Welsh control. Caradog ap Iestyn, the eldest son of Iestyn ap Gwrgant, was the only Welsh lord to retain lands in the Glamorgan lowlands after Fitzhamon had conquered them.
He retained the land between the River Neath and the River Afan, and he and his descendants were known as the "lords of Afan." His descendants are thought to include the Williams family of Aberpergwm. Iestyn ap Gwrgant"s arms can be seen today in a modern context as a banner of the arms forms the Flag of Glamorgan which itself forms a charge on the flag of Cardiff.
Additionally the arms are found within the crest of Pontypridd Rugby Football Club, a Rugby Union team from Pontypridd within the ancient boundaries of Morgannwg.
In his days many of the Cymry embraced the faith in Christ through the teaching of the saints of Cor-Eurgain, and many godly men from the countries of Greece and Rome were in Cambria. He first of the Cymry gave infants names. Foreign before, names were not given except to adults, and then from something characteristic in their bodies, minds, or manners.".
