Dubricius was only active in Ergyng and Gwent, while Teilo's associations with Llandaff have been transferred from his great abbey at Llandeilo Fawr.
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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.
Ergyng |
King Peibio and his descendants are rulers of the area attested from about 555 AD until, in the middle of the 7th century, Onbraust of Ergyng married Meurig of Gwent and the two neighbouring kingdoms were combined.