was a Celtic saint of the 6th century, of good birth in Armorica, who crossed over into Wales at the head of a large company, mostly his own relatives, supposed to have been exiled in consequence of the Frankish invasion, He is chiefly known as the first abbot of a monastery founded by him and Enion Freuhin, in the isle of Bardsey. An ancient Welsh inscription upon a rude pillar at Tywyn in Merionethshire, where was one of the many churches of his foundation, is thought to refer to him.