This brief paper begins by asking whether examples of hexameter rhythm in Sallust and Livy, two of Tacitus’ principal models, are allusions to, or even quotations from, Ennius’ Annals. After a brief survey of the rhythmical sequences in Tacitus’ Annals, the main focus of the paper is his obituary of Piso the Pontifex (Ann. 6.10.3), which, it is argued, constitutes an allusion to one of Ennius’ most famous fragments, the so-called “good companion” passage. I failed to mention Ennius in my recent commentary on Book 6, but the case for Ennian influence seems stronger than the parallels adduced by Skutsch and has interesting implications for the workings of allusion.