Saint Digain (also known as Dygain) was a 5th century Welsh saint and Prince of Dumnonia (now the English West Country).
Digain ap Constantine was said to be the son of Constantine Corneu, King of Dumnonia, and was born in c.429 He was believed to have had three brothers, Erbin (also sainted), Meirchion and Drustan, and possibly a sister (of unknown name).
Traditionally St Digain founded the church of that name in Llangernyw, meaning "the church of the Cornishman", in the county of Clwyd in Wales[1]. His sainthood was due being a confessor, meaning he was of remarkable virtue and confessed of the faith through writings and preachings, and has the feast day of November 21[2].