He was a holy Irish priest, who having left his own country, preached with great zeal in France, and died curate of Mareuil upon the Marne, in the sixth century. His relics are held in great veneration at Avenay in Champagne.
- Father Alban Butler. “Saint Tresain, or Tresanus, Priest and Confessor”. , 1866. CatholicSaints.Info. 8 February 2013. Web. 2 September 2015. <>