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In page Brittany:

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At the beginning of the medieval era, Brittany was divided among three kingdoms, Domnonea, Cornouaille and Broërec. These realms eventually merged into a single state during the 9th century.[1][2] The unification of Brittany was carried out by Nominoe, king between 845 and 851 and considered as the Breton Pater Patriae.[3] Among the immigrant Britons, there were some clergymen who helped the evangelisation of the region, which was still pagan, particularly in rural areas.[citation needed]