Iestyn ap Gwrgant

[1][2] 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. 500–520).

Iestyn ap Gwrgant's base is believed to have been at Dinas Powys, south west of Cardiff.

The popular version of historical events is that Iestyn, following a dispute with his rival Einion ap Collwyn, invited Robert Fitzhamon and his twelve knights into the region to settle the matter.

[3] Richard Williams Morgan claimed that a reference to a son of Caratacus called Saint Cyllin was found in the family records of Iestyn ab Gwrgant and used this as evidence of early entry of Christianity to Britain "Cyllin ab Caradog, a wise and just king.

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.