Keredic was a legendary king of the Britons as accounted by Geoffrey of Monmouth. It is unknown where he came from, but we know he was not a Saxon. According to Geoffrey, Keredic's rule was so unpopular that the Saxon inhabitants of the island enlisted the aid of an army of Vandals from Ireland to drive him from his kingdom.

Geoffrey's legendary Keredic may have been a conflation of Cerdic, the traditional founder of Wessex, who, despite his political affiliation with the Saxons, was likely of British descent himself, and another Cerdic , who reigned over the Celtic kingdom of Elmet in present day Leeds until his defeat at the hands of Edwin of Northumbria. Whatever the case, Geoffrey places a lentgthy interregnum between the expulsion of Keredic and the rise of the next British king, Cadvan.