Saint Paternus of Avranches in Normandy (c. 482-565) was born around the year 482, although the exact year is unknown, in Poitiers, Poitou. He was born into a Christian family. His father Patranus went to Ireland to spend his days as a hermit in holy solitude. Because of this, Paternus embraced religious life. He became a monk at the Abbey of Marnes in France. Later on, St Paternus went to Wales where he built a monastery called Llanpatenvaur. Before long, he wished to attain the perfection of Christian virtue by a life of penance in solitude. He went into solitude with his fellow monk, Saint Scubilion. The forest of Seicy in the diocese of Coutances was the place he became a hermit.
At a later date, the abbot of the region who knew Paternus recommended him to the Bishop of Coutances and the bishop made him a priest in 512. Together with St Scubilion he evangelized the western coasts and established several monasteries of which he was made the abbot general.