This paper provides an introductory survey of the evidence for Porphyry’s writings on rhetoric and a discussion of their context and influence, together with a detailed commentary on the testimonia and fragments. In paying tribute to Porphyry as polymath, Eunapius expresses uncertainty whether his most significant contribution was to rhetoric, literary studies, arithmetic, geometry, music or the various branches of philosophy (Lives of the Sophists 4.2.2-3 = 9.11-19 Giangrande). The aporia is a rhetorical figure (it is no coincidence that philosophy holds the final, climactic place), but we should not discount the initial claim that Porphyry was a major contributor to rhetoric, although that is not a perspective on Porphyry that will oc...