 This he faithfully fulfilled in Ireland, and then stripping himself of all earthly goods he retired for a time to a small island in the ocean.After some years he founded a monastery at Rathmat on the shore of Lough Corrib which Colgan identifies as Killursa, in the deanery of Annadown.His brothers Foillan and Ultan then joined the community at Rathmat, but Fursey seems to have renounced the administration of the monastery and to have devoted himself to preaching throughout the land, frequently exorcising evil spirits.