Compares Augustine's Commentary with the other Latin commentaries on Galatians from this period, chiefly with a view to tracing lines of influence, and uncovers a complex network of interconnections among them. An argument based largely on Augustine's Confessions and De Doctrina Christiana is put forward to show the strong likelihood that Augustine made use of Marius Victorinus’ Commentary when composing his own. Augustine's rejection of Jerome's interpretation of Galatians 2: 11–14 is explained, as is Jerome's rejection of Marius Victorinus’ interpretation of the same passage. Augustine's use of Ambrosiaster's Commentary is deemed highly probable but not demonstrable, as is Pelagius’ use of Augustine's Commentary. Parallels between Augustine's Commentary and that of the anonymous commentator discovered by H. J. Frede are judged insignificant.
Keywords: Ambrosiaster, anonymous commentator, Confessions, De Doctrina Christiana, Jerome, Pelagius, Marius Victorinus,