Diocese of Saint-Malo Dioecesis Maclovensis | |
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| Location | |
| Country | France |
| Ecclesiastical province | Tours |
| Information | |
| Denomination | Catholic |
| Rite | Roman |
| Dissolved | 1790 / 1801 |
| Language | Latin |
| Map | |
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The former Breton and French Catholic Diocese of Saint-Malo (Latin: Dioecesis Alethensis, then Dioecesis Macloviensis) existed from at least the 7th century until the French Revolution. Its seat was at Aleth until the 12th century, when it was moved to Saint-Malo. Its territory extended over some of the modern departments of Ille-et-Vilaine, Côtes-d'Armor, and Morbihan. Until the 860s, it was sometimes termed the bishopric in (the monastery of) Poutrocoet.