 Paul became a pupil of Saint Iidut at Llantwit Major and lived on Caldey Island with Samson of Dol and Gildas.He went to Brittany, establishing monasteries in Finistère at Ouessant on the north-west coast of Brittany, and at Lampaul on the island of Ushant, on the island of Batz and at Ocsimor, now the city of Saint-Pol-de-Léon, where he is said to have founded a monastery in an abandoned fort.He was consecrated bishop there under the authority of Childebert, King of the Franks.