Now available in English for the first time, Augustine's Commentary on Galatians is his only complete, formal commentary on any book of the Bible and offers unique insights into his understanding of Paul and of his own task as a biblical interpreter. Yet it is one of his least known works today - and this despite its importance in the past for such major figures as Aquinas, Luther, Erasmus, and Newman. The present volume seeks to remedy this situation by providing not only an English translation with facing Latin text, but also a comprehensive introduction and copious notes. Since Galatians happens to be the only biblical book commented upon by all the ancient Latin commentators - including Jerome, Pelagius, Ambrosiaster, and Marius Victorinus, as well as Augustine - it provides a basis for comparing them and for identifying Augustine's special concerns and emphases. Augustine's Commentary also has crucial links to other works he wrote at the time, especially his monastic rule and De Doctrina Christiana. Augustine's emphasis on Galatians as a pastoral letter designed to preserve and strengthen Christian unity links the commentary to his monastic rule, while his method and sources link it to, and indeed pave the way for, the theory of biblical interpretation set forth in the De Doctrina Christiana.