Teilo of Llandaff
- A short life of this Welsh saint. Mentions variants his name, including: Teilio, Teilus, Thelian, Teilan, Dillo, Dillon, and Elidius.
- http://www.saintpatrickdc.org/ss/0209.htm#teil

Early British Kingdoms: St. Teilo
- Biography of the early 6th-century Prince of Ceredigion, Abbot of Llandeilo Fawr and Bishop of Glywysing and Gwent.
- http://www.earlybritishkingdoms.com/bios/teilo.html

Catholic Online: St. Teilo
- Brief summary. Gives as variant spellings: Eliud, Issell, Teillo, Teilou, Dub, and Theliau.
- http://www.catholic.org/saints/saint.php?saint_id=2166

Catholic Encyclopedia: St. Teilo
- Welsh, late sixth century. Also known as St. Eliau, Eilliau, Teliarus, or Télo.
- http://www.newadvent.org/cathen/14473b.htm