Like those of so many other Irish saints the Acts of St. Crónán abound in miracles. The most surprising, perhaps, is the legend as to the transcribing of the Four Gospels by one of his monks, named Dimma, which is associated with the manuscript now known as the Book of Dimma. It appears that Dimma could only undertake one day's task, from sunrise to sunset. Crónán, however, bade him write, and then Dimma set to work, never ceasing until he had finished the Four Gospels, the sun continuing to shine for the space of forty days and forty nights - the scribe himself being unconscious that the work occupied more than one day. The scribe, Dimma MacNathi, signs his name at the conclusion of each of the Gospels, and he has been identified with Dimma, subsequently Bishop of Connor, who is mentioned with Crónán in the letter of Pope John IV in 640, in regard to Pelagianism in Ireland, but this identification cannot be sustained.