from http://www.hell-on-line.org/TextsJC.html (retrieved July 2008):

Laisrén

• The Vision of Laisrén, Irish, late 9th/early 10th C. [Bib.]

  Laisrén (or Laserian) [pron. LASS-eyr-ee-ahn ? - Editor]was probably abbot of Lethglenn (Leighlin), Carlow, d. 638. This vision is in Old Irish and a fragment of his visit to hell is all that remains.

  At the end of three days’ fast Laisrén experiences his soul leaving his body and being taken up by two angels. He is brought before a host of angels who are confronted by a host of devils — black ones with spears, dark brown ones with darts and shaggy haired ones with javelins. The devils argue that they should have him, but the angels tell them that he is not here to stay, but only so he can warn his friends about the afterlife. An angel, who holds a dialogue with Laisrén, takes him to hell where he sees a pit between two mountains, which they enter and from there proceed to the Mouth of Hell, where he sees the souls of those who will be damned if they don’t repent. He is led on to hell itself, which is a sea of fire with an unspeakable storm and waves. Here souls are pierced through their sinning bodily parts with nails.Here the vision breaks off.
  
  
• The Visison of Adamnán, Irish, early 10^th C. [Bib.]

  A vision of heaven and hell erroneously attributed to Adamnán, abbot of Hy and lona, biographer of St.Columba. Middle Irish. Part ...