Saint Teilo (Latin: Teliarus[2] or Teliavus; Breton: Teliau[2] or Telo; French: Télo[2] or Théleau; c. 500 – 9 February c. 560), also known by his Cornish name Eliud,[3] was a British Christian monk, bishop, and founder of monasteries and churches.

[4] Teilo's father is usually identified as Ensich ap Hydwn,[5] and he was thought to be the brother of Anowed, and the uncle of Saints Ismael and Euddogwy.

The first was established by the renowned Church leader and educator Dubricius (or Dyfrig), while the second was the school directed by Paulinus of Wales[9] at "Wincdi-Lantquendi" (thought to be Whitland) where he met and became a close companion of St David (Dewi).

Along with companions Aeddan and Ysfael, he traveled to Mynyw (St. Davids), where Dewi founded his abbey, and ousted an Irish pirate named Bwya, killed his cattle and burnt his fortress to the ground.

Teilo founded the first church in Llandaff,[11] headed a monastic school, and become bishop over Glywysing & Gwent.

[7] After his return to Llandeilo Fawr, where he is documented to have died on 9 February, although the year, though probably around 560, is unknown, he became one of the most venerated men in Wales.

He is said to have been canonized, though the exact date is not known, but he is acknowledged as one who undertook extraordinary labours in behalf of the church in Wales and Cornwall and who was also celebrated in Armorica (Brittany and surrounding provinces).