This chapter is an overview of the ways in which Seamus Heaney engages with Greek and Latin mythologies and literatures in his work, from Death of a Naturalist (1966) to Aeneid VI (2016), and from allusions to more sustained forms of intertexuality, including versions. First discussing classical presences in his early poetry, the chapter shows how Heaney became increasingly interested in Greek and Latin literatures after the late 1980s, at a time of personal and political crises in Northern Ireland. It explains that, in those years, classical texts helped him address family deaths as well as contemporary violence in the North. Finally, it argues that in his rewritings of Sophocles, and in his classical poetry, mostly inspired by Virgil, Heaney ultimately revisits Ireland as a classical and secular space, reflecting social and cultural changes on the island, in the context of the Northern Irish peace process, as well as of globalisation.