Ailerán was one of the most distinguished scholars at the School of Clonard in the 7th century.

[2] His early life is not recorded, but he was attracted to Clonard by the fame of St. Finnián and his various disciples.

He died of the Yellow Plague, and his death is recorded in the Annals of Ulster.

[4] Because of his knowledge of the works of Origen, Philo, St. Jerome, St. Augustine, and others, he was well versed in patristic literature.

[2] This was published in the Benedictine edition of the Fathers, and the editors said that they published it although Aileran was not a Benedictine, because he " unfoulded the meaning of the Sacred Scripture with so much learning and ingenuity that every student of the Sacred Volume and especially preachers of the Divine Word will regard the publication as most acceptable.