(Canto 2, lines 18-19)
These lines are slightly unclear. Sapegno proposes two explanations. It might refer to the lasting influence of Aeneas, his role in founding the Roman empire and the church, or the accomplishments of his descendants, including Caesar and Augustus. Another explanation focuses on the personal character and noble standing of Aeneas himself, and his alliances by marriage etc. with Creusa, Dido, Lavinia and others.
There is a passage touching the virtue and lasting influence of Aeneas in Dante's own treatise "De Monarchia":
"...the testimony of the ancients is convincing, since Virgil, our divine Poet, throughout his Aeneid testifies in everlasting remembrance that the father of the Roman people was Aeneas, the famous king; and Titus Livius, illustrious writer of Roman deeds, confirms this testimony in the first part of his volume which begins with the capture of Troy. So great was the nobleness of this man, our ancestor most invincible and most pious, nobleness not only of his own considerable virtue, but that of his progenitors and consorts, which was transferred to him by hereditary right, that I cannot unfold it in detail, 'I can but trace the main outlines of truth.' As to his personal nobility, hearken to our poet in the first book of the Aeneid, introducing Ilioneus with the plea, 'Aeneas was our king, than whom none other was more just and pious, none other greater in war and arms.' [...]"