Aeneas emerges from the smoking wreck of Troy, which stands of course for the smoking wreck of the republic which Augustus had inherited from his father.
Aeneas' greatest quality is his Piatas or devotion which he displays to his gods which he displays to his father and which he ultimately displays to his role as the founder of Rome.
Thus he proceeded, like Aeneas with his father; the bats circling round his head, nightjars flapping their wings within a yard of his face, and not a human being within call.
文学百科 The Literature Book (Big Ideas Simply Explained)
Throughout the epic, Virgil emphasizes Aeneas' pietas, his virtue and duty, which is steered by fate and the intervention of the gods, taking him from his home to his destiny in Latium.
Virgil presents Aeneas as a sort of model for Augustus, and that's probably one of the reasons the emperor was so eager to save the poem from destruction.