De duodecim abusivis saeculi (“On the Twelve Abuses of the World”), also titled simply De duodecim abusivis,[1] is a Hiberno-Latin treatise on social and political morality written by an anonymous Irish author between 630 and 700,[2][3] or between 630 and 650.[4][5][6][7] During the Middle Ages, the work was very popular throughout Europe.
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