The whole Aeneid is a meditation on Roman history in which Aeneas’ sufferings lead directly to the altae moenia Romae. The paper summarizes the principal ways in which Virgil sets historical reference within epic narrative. Part of the reason why research hitherto has not come up with any answers to the questions that this paper tries to pose is that Virgil specialists tend to look too closely and exclusively at epic (and sometimes tragic) antecedents. We should perhaps look at two less obvious poetic genres: the literature of prophecy, and aetiological poetry. The Aeneid works, intellectually, as a new kind of epic, formally mythological, but often, in its implications, historical, because it has taken on (and this is the ‘mixing of genres’, never practised so radically or brilliantly elsewhere) a powerful, inspiring element from aetiological poetry.