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[citation needed] He was believed to have had three brothers, Erbin (also sainted), Meirchion and Drustan, and possibly a sister (of unknown name).
[citation needed] Traditionally St Digain founded the church of that name in Llangernyw, meaning "the church of the Cornishman", in the county of Conwy in Wales.
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.
This article about a saint from the predecessor states to the United Kingdom is a stub.