In the mid 11th century Enniaun 'the son of Cincenn' was ordained priest to the church at Hentland. At The time there seems to have been a double dedication, perhaps even, two distinct structures, for Enniaun was ordained to 'hennlann dibric & lannteliau in uno cimiterio' - 'the old church of Dubric and the church of Teilo in one cemetary'

Dyfrig was the premier saint of Ergyng. Teilo, was a pupil of Dyfrig's who himself rose to prominance in the British Church and became a major figure in the Church in Brittany. He probably studied at Dyfrig's first foundation at Llanfrother on the Wye, in Hentland parish. Teilo is reckoned to have been born in about AD 500. Reputed to be a cousin, friend, and disciple of St David, Teilo founded the first church on the site which became Llandaff Cathedral and where he later became bishop, generally counted as the first Bishop of Llandaff. He also founded the the monastery of Llandeilo Fawr 'great church of Teilo' in Dyfed which for centuries was one of the main centres of monasticism and learning in Wales.

During the outbreak of yellow plague in 549 Teilo took the a group of surviving monks through Cornwall to Brittany where a community was founded at Dol (Dol-de-Bretagne). Among the group was Samson - St Sampson of Dol. Teilo's skull was placed in a reliquary in the south chapel of Llandaff Cathedral. Relics are widely distributed, and are venerated at Landeleau (Finistère), Plogonnec (Finistère), and Saint-Thélo (Côtes-du-Nord).