Cawrdaf was a 6th-century king of Ergyng, a territory in the region of Britain. Though historical records regarding his specific military achievements are scarce, he is identified in Welsh literary traditions as one of the three chief officers of the island of Britain. Some accounts also place him among the forty-two advisors serving King Arthur. He is recognized as the son of Caradoc Freichfras and the father of Medrawd, establishing a lineage connected to several Welsh dynasties.