The article explores the origin of C. 3,43,1, which is a Latin epitome (Alearum lusus) of an originally Greek constitution of Justinian's. The main issues discussed are when this constitution was translated, epitomized and by whom and when it was inserted in book III of the Codex. This is done by investigating the traces of the approximate times when the influence of the constitution in legal doctrine is apparent, both in civil and canon law. Furthermore, some commentaries on the Decretum Gratiani appear to reveal further information on the origin of the Latin text. The article aims at contributing to a better understanding of the genesis of the text of the Codex Justinianus as we know it in the early modern editions and Krüger's 1877 edition. © 2013 Koninklijke Brill NV, Leiden.