Two centuries later, Brittany was already Christianized. In Armorica, the penetration of Christianity was less marked.
From the5th century onwards, religious figures from island Brittany, accompanied by their followers, arrived in large numbers. Perhaps they were driven out by pressure from the Scots of Ireland, or perhaps they were exiled to the mainland following doctrinal differences, or perhaps they wanted to carry out an evangelizing mission – the uncertainties remain. They were monks, diplomats, organizers.
Starting from the coast and working their way up the valleys of the Gouet, Blavet, Rance and Vilaine rivers, they founded hermitages or small clan communities, of which they were the leaders, and left their mark on this territory.
These religious navigators are the well-known Breton “saints”: Saint Quay, Saint Malo, Saint Budoc, Saint Maudez, Saint Briac, Saint Brieuc, Saint Tugdual, Saint Paul-Aurélien… and many others among the 700 Breton saints listed.