¹³O'Donnell, Manus, Andrew O'Kelleher, Gertrude Schoepperle, and Richard Henebry. Betha Colaim Chille. Life of Columcille. Urbana, IL: University of Illinois under the Auspices of the Graduate School, 1918. 5.
One of the enduring legends of the saint is that his mission to the Picts in Iona was occasioned by his exile from Ireland under duress after he had lost both a "copyright" suit and the ensuing ferocious battle. In this story the saint made an unauthorized copy of a Psalm book, and the high king ruled that he was required to return it to the owner of the original, reasoning that "To every cow its calf, to every book its copy." It is, however, more likely that Colum Cille's journey to Scotland was entirely voluntary. This book may be read in its entirety here.