Why is St. Dyfrig a saint?

Saint Dubricius (also known in Welsh as Dyfrig and in corrupt Norman-French as Devereux) (c. 465 - 550 or 612) was a 6th century Briton ecclesiastic venerated as a saint. He was the evangelist of Ergyng (now Archenfield) and much of South-East Wales. For more information about this saint, click on this link.