The book, about the school-day struggles of a boy named Greg, is the first in a series written by American author Jeff Kinney, which has sold more than 150m copies worldwide. It's been translated by Monsignor Daniel B Gallagher, a Latin specialist who also curates the Pope's Twitter feed in the ancient language. Commentarii de Inepto Puero, as the new version is titled, will be published in Italy on 6 May, with releases in Europe and the rest of the world planned for later in the year.