Four, however, are beyond repair; so Aeneas, seeing he no longer has ship-room for all his force, allows the Trojans most anxious to rest to settle in Drepanum, taking with him only those who are willing to share his fortunes.
Before he leaves, his father's ghost appears to him, bidding him, before settling in Latium, descend into Hades by way of Lake Avernus, and visit him in the Elysian Fields to hear what is to befall his race.
When Aeneas leaves Drepanum on the next day, his mother pleads so successfully in his behalf that Neptune promises to exact only one life as toll.
"One life alone shall glut the wave; One head shall fall the rest to save." _Book VI._ Steering to Cumae, where the Sibyl dwells, Aeneas seeks her cave, whose entrance is barred by bronzen gates, on which is represented the story of Daedalus,--the first bird man,--who, escaping from the Labyrinth at Crete, gratefully laid his wings on this altar.
We are further informed that the Sibyl generally wrote her oracles on separate oak leaves, which were set in due order in her cave, but which the wind, as soon as the doors opened, scattered or jumbled together, so that most of her predictions proved unintelligible to those who visited her shrine.

After a solemn invocation, Aeneas besought her not to baffle him by writing on oak leaves, and was favored by her apparition and the announcement that, after escaping sundry perils by land and sea and reddening the Tiber with blood, he would, thanks to Greek aid, triumph over his foes and settle in Latium with a new bride.

Undaunted by the prospect of these trials, Aeneas besought the Sibyl to guide him down to Hades, to enable him to visit his father, a journey she flatly refused to undertake, unless he procured the golden bough which served as a key to that region, and unless he showed due respect to the corpse of his friend.

Although both conditions sounded mysterious when uttered, Aeneas discovered, on rejoining his crew, that one of his Trojans had been slain.

After celebrating his funeral, our hero wandered off into a neighboring forest, where some doves--his mother's birds--guided him to the place where grew the golden bough he coveted.
Armed with this talisman and escorted by the Sibyl, Aeneas, by way of Lake Avernus, entered the gloomy cave which formed the entrance to Hades.