Ancient Diocese of Saint-Malo
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The former Breton and French Catholic Diocese of Saint-Malo existed from at least the 7th century until the French Revolution. Its seat was at Aleth up to some point in the 12th century, when it moved to Saint-Malo. Its territory extended over some of the modern departments of Ille-et-Vilaine, Côtes-d'Armor, and Morbihan.