Dragon

When the labours had been performed in eight years and a month, Eurystheus ordered Hercules, as an eleventh labour, to fetch golden apples from the Hesperides, for he did not acknowledge the labour of the cattle of Augeas nor that of the hydra. These apples were not, as some have said, in Libya, but on Atlas among the Hyperboreans. They were presented < by Earth> to Zeus after his marriage with Hera, and guarded by an immortal dragon with a hundred heads, offspring of Typhon and Echidna, which spoke with many and divers sorts of voices. With it the Hesperides also were on guard, to wit, Aegle, Erythia, Hesperia, and Arethusa. So journeying he came to the river Echedorus.

[...]

Now Prometheus had told Hercules not to go himself after the apples but to send Atlas, first relieving him of the burden of the sphere; so when he was come to Atlas in the land of the Hyperboreans, he took the advice and relieved Atlas. But when Atlas had received three apples from the Hesperides, he came to Hercules, and not wishing to support the sphere< he said that he would himself carry the apples to Eurystheus, and bade Hercules hold up the sky in his stead. Hercules promised to do so, but succeeded by craft in putting it on Atlas instead. For at the advice of Prometheus he begged Atlas to hold up the sky till he should> put a pad on his head. When Atlas heard that, he laid the apples down on the ground and took the sphere from Hercules. And so Hercules picked up the apples and departed. But some say that he did not get them from Atlas, but that he plucked the apples himself after killing the guardian snake. And having brought the apples he gave them to Eurystheus. But he, on receiving them, bestowed them on Hercules, from whom Athena got them and conveyed them back again; for it was not lawful that they should be laid down anywhere.


- Apollodorus, Library, Book 2, Chapter 5, Section 11