Irish saint, commonly, but perhaps erroneously, called the Culdee, author of a Félire or verse martyrology. He apparently spent the latter part of his life in the community at Clonenagh, Co. Laoise, and in a nearby hermitage. At some point he joined the fraternity of Tallaght, near Dublin. Here he collaborated with St Máel Rúain (d. 792) on the compilation of the Martyrology of Tallaght, the oldest Irish martyrology and a major source of his own. Both martyrologies in their extant form can be dated c.800 or c.830. Feast day, 11 Mar.