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.