In 549 Teilo, with a small group of monks, moved to Dol in Brittany.
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Born in Cornouaille to Cybydan, a member of one of the royal families, Budic is said to have been expelled and fled to the court of King Aircol Lawhir of Dyfed, where he wed Arianwedd, the daughter of Saint Issel and the sister of Saint Teilo.
The diocese was reputedly founded in 560 or earlier by Saint Teilo, during the monastic movement initiated by Saint Dubricius who presided over several monasteries in Ergyng, including Hentland and Moccas.