In 331, Constantine I commissioned Eusebius to deliver fifty Bibles for the Church of Constantinople. Athanasius recorded Alexandrian scribes around 340 preparing Bibles for Constans. Little else is known, though there is plenty of speculation. For example, it is speculated that this may have provided motivation for canon lists, and that Codex Vaticanus and Codex Sinaiticus are examples of these Bibles. Together with the Peshitta and Codex Alexandrinus, these are the earliest extant Christian Bibles. There is no evidence among the canons of the First Council of Nicaea of any determination on the canon. However, Jerome (347–420), in his "Prologue to Judith", makes the claim that the Book of Judith was "found by the Nicene Council to have been counted among the number of the Sacred Scriptures".