Terentianus Maurus, a North African writing probably in the third century a.d., bequeathed to posterity a preface and three polymetric poems: De litteris, De syllabis and De metris. The poems’ titles reflect their content, the first two covering the pronunciation of letters and syllables and the third discussing the details of a bewildering array of metres. Unpromising subject matter for poetry? On the contrary. Terentianus Maurus uses this raw material to display his extraordinary poetic skill, while also conveying useful technical information. This paper first examines the programmatic preface to his poems, which is studded with intertextual gems and shines with every kind of literary polish. It then turns to look at passages from the rest of Terentianus’ poetry to see how he puts the ideals of his preface into poetic practice. The paper aims to show that Terentianus Maurus is not, or not just, a grammarian, but rather a consummate literary artist in the tradition of learned didactic verse.