It is now widely recognised that Medea's last words in her elegiac letter to Jason, Heroides 12, combine the terrible foreshadowing of infanticide with a telling metapoetic signature:
quo feret ira, sequar! facti fortasse pigebit;
et piget infido consuluisse uiro.
uiderit ista deus, qui nunc mea pectora uersat!
nescioquid certe mens mea maius agit.
(Ov. Her. 12.209-12)
Where my anger leads, I'll follow. Perhaps I'll regret my deed—
as I regret the attention I paid to my faithless husband.
Be that the concern of the god who now goads my breast!
Certainly, something greater is stirring in my mind!
Ovid positions Heroides 12 as ‘a “prequel” to his own Medea-tragedy’, that maius opus which notionally provides Medea with an appropriate generic setting in which to exact her revenge; elegy is too light a medium to bear the weight of so tragic a denouement. Heroides 12 thus concludes by adapting itself to the contours of the larger Ovidian career—a career in which he was to revisit the Medea-theme for the third time in Metamorphoses 7. There, her life-story is selectively told from the beginning of the Argonautic voyage and Medea's first infatuation with Jason to her magical intervention in his gaining of the golden fleece (1-158); from her rejuvenation of Jason's father, Aeson, to the dastardly way in which she induces the daughters of Pelias, Aeson's half-brother, to murder their father (159-349); and from the briefly told murder of her children at Corinth to her marriage to Aegeus and the attempted murder of Theseus, his son, at Athens (394-423). At this point Medea takes flight once more (424; cf. 350-93, in the wake of Pelias' murder) and disappears from the Metamorphoses for good—or, we might imagine, for yet more evil to be worked.