High Quality Content by WIKIPEDIA articles! Saint-Brieuc (Breton: Sant-Brieg, Gallo: Saent-Berioec) is a commune in the Côtes-d'Armor Department in Brittany in north-western France. It has a cathedral.Saint-Brieuc is named after a Welsh monk Brioc, who evangelized the region in the 6th century and established an oratory there. Bro Sant-Brieg/Pays de Saint-Brieuc, one of the nine traditional bishoprics of Brittany which were used as administrative areas before the French Revolution, was named after Saint-Brieuc.