The Hesperides, the daughters of Atlas, dwelt in an island in the far west, whence they derived their name.
They were appointed by Hera to act as guardians to a tree bearing golden apples, which had been presented to her by Gæa on the occasion of her marriage with Zeus. It is said that the Hesperides, being unable to withstand the temptation of tasting the golden fruit confided to their care, were deprived of their office, which was henceforth delegated to the terrible dragon Ladon, who now became the ever-watchful sentinel of these precious treasures.
The names of the Hesperides were Aegle, Arethusa, and Hesperia.
From: Berens, E.M. The Myths and Legends of Ancient Greece and Rome. New York: Maynard, Merril, & Co., 1880. Text in the public domain.