In the fourth book of the Aeneid Virgil presents the epic's titular hero as fated to found Rome, initially neglecting and ultimately reassuming his mission, all the while being accorded praise or blame for his progress. In this article I shall re-examine Virgil's use of the specifically Chrysippan Stoic doctrine of Fate and human responsibility in Aeneid 4, with a focus on three key points: the role of assent in creating a compatibility of Fate and human responsibility; the ‘Lazy Argument’, (...) the position that Chrysippus combatted, that if things are fated they will happen without any effort on my part; and the Stoic conception of Fate as a chain of causes that includes human assents. I shall argue that Virgil's impeccable, almost obsessive, scholarship results in a detailed homage to Chrysippan Stoic doctrine that actually alludes to its finer points. I restrict my comments to Book Four on the grounds that the Dido-episode tests to the limit Aeneas’ resolve to ‘follow … Italy’, even if non sponte, and that the juxtaposition with Dido sheds added light on the picture. I hope thereby to contribute to a topic of research that deserves renewed investigation using the discoveries in Hellenistic philosophy over the last two generations. (shrink)