Cadyrnerth ap Porthawr Gandwy

   Cadyrnerth, the son of Porthawr Gandwy, appears in one of the Triads ranked with Gwalchmai for his urbanity towards guests and strangers; and in another he is said to have preferred residing with King Arthur to exercising the sovereignty over his own dominions, which was, according to Lady Guest, in some measure because the refined habits of the Court were more congenial to a person of his cultivation and taste.
   The Triads report that there were three sovereigns of the Court of Arthur: Goronwy the son of Echel Vorddwytwll, Ffleidwr Fflam the son of Godo, and Cadyrnerth (Cadreith) the son of Porthfawr Gadw, and because they were princes possessing territory and dominion but by preference remained as knights in the Court of Arthur, they were considered the chiefs of honour and gentility.
   In the tale of Geraint and Enid, while every one else is engrossed by the pleasures of the chase, we find Cadyrnerth's ideas of propriety violated by Gwenhwyvar's riding up with no other retinue than a single hand-maiden. He hastens to Arthur to inform him of the breach of etiquette, who instantly rectifies it by commanding Gildas and the scholars of the Court to attend her.