"Thou sayest, that of Silvius the parent"

(Canto 2, line 13)

"Of Silvius the parent" is Aeneas. Book 6 of the Aeneid records how Aeneas travels through the underworld. Silvius was the son of Aeneas and Lavinia and the half brother of Ascanius. He later became king of Alba Longa, which Ascanius had founded and which preceded the Roman empire.