 It was only on Aristotle’s moral philosophy treatises—the Ethics, Economics and Politics—that Lefèvre wrote full-scale commentaries. In addition to his brief Ars Moralis, an introduction to Aristotle’s ethics (1494b), he devoted considerable energy to making available the recent translations of Aristotle’s Nicomachean Ethics by the Byzantine émigré Johannes Argyropolus and the Florentine humanist Leonardo Bruni, as well as the “old” translation, now known to be by Robert Grosseteste (1497). Beginning a tradition of editing philosophical works which would span the sixteenth century, Lefèvre typically encouraged readers to compare texts, publishing the three translations of the Ethics together in one volume (his own commentary accompanied the translation of Argyropolus). These editions and commentaries have been seen as the origin of a distinctively humanist tradition of moral philosophy (Kraye 1995: 104–105).