Saint Maglorious was an abbot of Irish origin. He was educated at Llantwit Major by Illtud. With Samson he went to Brittany and founded monasteries under the protection of King Childebert. Maglorius became abbot of one of them near Dol. After some years he retired to Sark, where he founded a monastery and died. A connection with Jersey is also claimed by his late Life: his removal of a tiresome dragon was rewarded by gifts of land. He died in 575.