Lasrén mac Feradaig

Lasrén (also Laisrén, Laisrán) mac Feradaig or Lasrén of Iona (d. 605) was an Irish monk and the third abbot of Iona (c.600-605), in succession to Baíthéne. Lasrén worked during the abbacy of St Columba and administered the monastery of Durrow for the saint in the years before attaining Iona. Like Baíthéne before him, he was a kinsman of Columba from the royal dynasty of the Cenél Conaill. His father, Feradach meaning 'woodsman', was a cousin of the saint.

Lasrén (meaning flame) first appears in Adomnán's Life of St Columba as one of Columba's close companions as he travelled through Ardnamurchan in Argyll, perhaps in 572. Later, when he had been appointed prior of Columba's monastery at Durrow (Co. Offaly, in the midlands of Ireland), which was probably founded in the 580s or 590s, Lasrén appears to have been remembered as a benevolent man, but the story is also likely to have been designed to show that Lasrén was destined for the abbacy of Iona. According to the Martyrology of Tallaght, his feast-day was observed on 16 September.