Cicero's Topica is one of the canonical texts on ancient rhetorical theory. This is the first full-scale commentary on this work, and the first critical edition of the work that is informed by a full analysis of its transmission. - ;Cicero's Topica is one of the canonical texts on ancient rhetorical theory. This is the first full-scale commentary on this work, and the first critical edition that is informed by a full analysis of its transmission. Cicero recommends an Aristotelian theory of argumentation to an expert on Roman law. The introduction and the commentary seek to elucidate the exact