St Teilo | 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.
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Dubricius was only active in Ergyng and Gwent, while Teilo's associations with Llandaff have been transferred from his great abbey at Llandeilo Fawr.
The 'altar of St. Teilo" has in the past been associated with the monastery at Llandaff but, as it has been determined that the third, fourth and sixth marginal inscriptions refer to lands within fifteen miles of Llandeilo Fawr, it is now thought that the book originated there.
In the 6th century, St Teilo, the founder of Llandaff Cathedral in Cardiff, was made a patron saint of the church along with Llandaff.
He was curate of St Dyfrig, Cardiff from 1927 to 1935 before becoming the first Warden of St Teilo's Hall of Residence at the University College of South Wales, Cardiff, also serving as Llandaff Diocesan Missioner from 1936 to 1940.
In 549 Teilo, with a small group of monks, moved to Dol in Brittany.