Marius Victorinus, a professor of rhetoric in mid-fourth-century Rome, wrote the first Latin commentaries on the apostle Paul, whose letters have played a vital role in Western Christian thought. This is the first English translation of Victorinus' commentary on Galatians, which is a relevant and lively presentation of the apostle's passion for the freedom of the gospel. The accompanying notes and introduction, while engaged with relevant scholarship, are accessible to readers interested in early Christian interpretations of the Bible.