But Earth, vexed on account of the Titans, brought forth the giants, whom she had by Sky. These were matchless in the bulk of their bodies and invincible in their might; terrible of aspect did they appear, with long locks drooping from their head and chin, and with the scales of dragons for feet. They were born, as some say, in Phlegrae, but according to others in Pallene. And they darted rocks and burning oaks at the sky. Surpassing all the rest were Porphyrion and Alcyoneus, who was even immortal so long as he fought in the land of his birth. He also drove away the cows of the Sun from Erythia. Now the gods had an oracle that none of the giants could perish at the hand of gods, but that with the help of a mortal they would be made an end of. Learning of this, Earth sought for a simple to prevent the giants from being destroyed even by a mortal. But Zeus forbade the Dawn and the Moon and the Sun to shine, and then, before anybody else could get it, he culled the simple himself, and by means of Athena summoned Hercules to his help. Hercules first shot Alcyoneus with an arrow, but when the giant fell on the ground he somewhat revived. However, at Athena's advice Hercules dragged him outside Pallene, and so the giant died.
- Pseudo-Apollodorus, The Bibliotheca, Book 1, Chapter 6