(or Fiech) (415–520) Bishop of Leinster. He was a nephew of Dubhtach, the famous bard, by whom he was instructed in the art of song. Saint Patrick ordained him missionary bishop for Leinster. He founded the churches and monasteries of Domnach-Fiech, east of the Barrow, and Sletty, near Carlow. He is the reputed author of a metrical life of Saint Patrick, in Irish, said to be the earliest biography of the saint. He was buried in his own church at Sletty. Feast, 12 October.
- “Saint Fiacc”. . CatholicSaints.Info. 30 January 2013. Web. 9 February 2016. <>