639), was an early Irish saint and abbot of Lethglenn or Leithglenn, now Old Leighlin in County Carlow, who is supposed to have lived in the 6th and 7th centuries.

After a three nights' fast, his soul is taken up by two angels, who escort him to Hell to show him the horrors that await unredeemed sinners.

The angels explain to one devil eager to take Laisrén from them that their guest is granted the vision in order that "he will give warning before us to his friends.

[9] In a note added to the Félire Óengusso, Molaise is said to have pulled out a hair from St Sillán's eyebrow which had the special property that anyone who saw it in the morning died instantly.

[10] Because of the fiery connection between sunrise and Molaise's name, from lasair "flame", the anecdote has been interpreted as relating to solar mythology.