(“On the Twelve Abuses of the World”), also titled simply De duodecim abusivis, is a Hiberno-Latin treatise on social and political morality written by an anonymous Irish author between 630 and 700, or between 630 and 650. During the Middle Ages, the work was very popular throughout Europe. Origin In the manuscripts, the work is frequently ascribed to a named author, most commonly Saint Cyprian or Saint Augustine; this led to early editions being published among the works of these authors. In 1905, however, John Bagnell Bury pointed out that it quoted from the Latin Vulgate, which was incompatible with an attribution to Cyprian or Augustine. He pointed out that the ninth abuse was quoted almost entirely in the Collectio canonum Hibernensis, where it was ascribed to Saint Patrick; and that extracts from the same section were quoted in a letter addressed by Cathwulf, circa A.D. 775, to King Charles the Great, and preserved in a ninth-century manuscript. He concluded that this evidence “proves that the treatise is older than A.D., 700, and strongly suggests that its origin is Irish, that it was ascribed in Ireland to Patrick, and travelled to Gaul under his name.” In his 1909 edition, Siegmund Hellmann (de) adduced further evidence, establishing it as the work of an anonymous Irish author of the 7th century. Since then, its author is conventionally known as Pseudo-Cyprian. Sources The text is based largely on the Bible, containing “over thirty citations from the Old Testament and twenty-three from the New excluding the Gospels, with nineteen more from the Gospels”; these citations are made from the Latin Vulgate. Ever since Hellmann’s edition, the Rule of St. Benedict has also been regarded as an important source. Hellmann regarded the ordering of the text into twelve abuses as a reversal of the twelve steps of the ladder of humility from the seventh chapter of the Rule. Breen thought it was more probable that it drew instead from the Regula Magistri, a different text which was itself a source for that chapter in the rule of St. Benedict. The text also seems to have drawn on various of the Church Fathers, although none are cited by name; particularly, Origen, Cyprian, Ambrose, Augustine, Rufinus, Jerome, Cassian and Gregory the Great. Hellmann thought that the text drew on St Isidore. Almost everyone agreed with this, but Breen did not. Twelve abuses De duodecim abusivis condemns the