Carantoc was a 6th-century Welsh abbot and confessor who is believed to have been a prince of the Ceredigion royal house. Choosing a religious life over his royal inheritance, he established several monastic communities across Wales, Cornwall, Somerset, Brittany, and Ireland. His hagiographies suggest he traveled to Ireland to support the mission of Saint Patrick. He is also noted in early writings as a figure who interacted with King Arthur, helping the king by using prayer to subdue a dragon.