The former Breton and French diocese of Tréguier existed in Lower Brittany from about the sixth century, or later, to the French Revolution. Its see was at Tréguier, in the modern department of Côtes-
Tréguier Cathedral
Diocese of Saint-Brieuc
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The Diocese of Saint-Brieuc and Tréguier is a Latin Church diocese of the Catholic Church in France. The diocese comprises the department of Côtes d'Armor in the Region of Brittany. The diocese is cur
Roman Catholic Diocese of Tréguier
…century, or later, to the French Revolution. Its see was at Tréguier, in the modern department of Côtes-d'Armor. The title continues in the contemporary diocese of Saint-Brieuc and Tréguier. St. Tudgual (Tugdual, Tudual), said to be the nephew of St. Brieuc (who had emigrated from Cardigan), was a bishop who came to Brittany from overseas…
Saint-Brieuc Cathedral
Bishop Denis Moutel