- Catholic Encyclopedia: St. Teilo - Welsh, late sixth century. Also known as St. Eliau, Eilliau, Teliarus, or Télo.
- Catholic Online: St. Teilo - Brief summary. Gives as variant spellings: Eliud, Issell, Teillo, Teilou, Dub, and Theliau.
- Early British Kingdoms: St. Teilo - Biography of the early 6th-century Prince of Ceredigion, Abbot of Llandeilo Fawr and Bishop of Glywysing and Gwent.
- Teilo of Llandaff - A short life of this Welsh saint. Mentions variants his name, including: Teilio, Teilus, Thelian, Teilan, Dillo, Dillon, and Elidius.
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