Caradawc, Cradawc, Cradawg
In Bonedd y Arwyr he is, together with his brother Siawn, said to be related to Arthur through his sister’s marriage to Arthur. They are called gwyr Kaer Tathal (‘men of Caer Dathal’).
The name seems to be the source of the French Caradocs.
Culhwch and Olwen | Late 11th century