According to tradition, Cadoc was a great scholar and traveller. He completed his studies in the classics under a rhetorician named Bachan, and made a number of journeys to Rome and even to Jerusalem (c.547). Whatever the truth of this, he certainly paid a number of visits to Ireland and probably also to Cornwall or Brittany. His cult extended from south Wales, where there are about fifteen placename dedications, to Cornwall. He must not be confused with the Scottish saint of the same name or with the Breton saint Cadou or Catfodw from whom Île Cadou on the Armorican peninsula takes its name. It is probable that the bulk of what is known of Cadoc – apart from what Lifris invented – derives from Irish tradition, oral or written, which placed him in close association with Finnian, who apparently became his disciple. The community of Llancarfan continued to have close ties with the community of Clonard during the middle ages.