Cumaean Sibyl
Virgil borrowed the image of the two gates in lines 893–898 of Book 6 of his "Aeneid", describing that of horn as the passageway for true shadows and that of ivory as that through which the Manes in the underworld send false dreams up to the living. Through the latter gate Virgil makes his hero Aeneas, accompanied by the Cumaean Sibyl, return from his visit to the underworld, where he has met, among others, his dead father Anchises: