The historical Constantine of Dumnonia may have influenced later traditions, known in Southwestern Britain as well as in Wales, Ireland, and Scotland, about a Saint Constantine who is usually said to have been a king who gave up his crown to become a monk.
The Annales Cambriae (Welsh Annals) and the Annals of Ulster record the conversion of a certain Constantine; these may be a reference to the Cornish saint and therefore to the historical figure [REF].