List of Breton saints

Breton saints refers to both the innumerable people who lived, died, worked in, or came to be particularly venerated in the nine traditional dioceses of Brittany (Cornouaille, Dol, Léon, Nantes, Rennes, Saint-Brieuc, Saint-Malo, Tréguier, Vannes) who were accepted as saintly before the establishment of the Congregation of Rites (now the Congregation for the Causes of Saints), and those saints, blesseds, venerables, and Servants of God who have come to be recognized since that time.

Before the Bretons came, the land now known as Brittany was known as Armorica within the Roman province of Gallia Lugdunensis.

Clair became the first Bishop of Nantes around AD 280 and died early in the third century;[3] Adeodatus preached primarily in the area of Vannes.

Other Armorican saints include Similien, the third Bishop of Nantes, who converted the brother-martyrs Donatian and Rogatian.

With the coming of the Bretons, the seven ancient dioceses were established by the seven founding saints.