I have read that the Julians claimed the founder of the family was none other than Aeneas, who escaped to the Italian peninsula after the fall of Troy. He was seduced by the goddess Venus, so the family claimed divine origins.
I THINK there may be some reference to this in Virgil, actually given it is called the Aenaid, I am pretty sure it is mentioned! LOL
Didnt Virgil write the poem in order to flatter Augustus anyway?