Commentary Inf I 75

The phrase superbo Ilïón clearly mirrors Aeneid III.2-3, 'superbum / Ilium.' It almost certainly has a moralizing overtone here (see also C.Inf.I.106), while in Virgil it probably only indicates the 'topless towers of Troy' (the phrase is Alexander Pope's); in Dante it gives us some sense that Troy may have fallen because of its superbia, or pride.