Illtud, Abbot
- His life and legend. Variants on the saint's name include Iltut, Illtut, and Illtud.
- http://www.saintpatrickdc.org/ss/1106.htm#illt

St. Illtud Farchog
- Biography of the early 6th century founder and abbot of Llanilltud Fawr in South Wales.
- http://www.earlybritishkingdoms.com/bios/illtud.html

St. Illtyd
- Also known as Iltutus. Late fifth- to early sixth-century Welsh saint. Biographical entry in the Catholic Encyclopedia.
- http://www.newadvent.org/cathen/07661a.htm