Hercules was possessed of the greatest physical strength. He had a great enemy in Hera, who, knowing that the child who should be born that day was fated to rule over all the descendants of Perseus, contrived to delay the birth of Hercules and hasten that of Eurystheus. Eurystheus thus, by decree of fate, became chief of the Perseidæ. While yet in the cradle, Hercules showed his divine origin by strangling two serpents sent by Hera to destroy him. In course of time Eurystheus summoned Hercules to appear before him, and ordered him to perform the labours which, by priority of birth, he was empowered to impose on him. Hercules, unwilling to obey, went to Delphi to consult the Oracle, and was informed that he must perform ten labours imposed on him by Eurystheus, after which he should attain to immortality. The first labour imposed on him was to destroy the lion that haunted the forests of Nemea and Cleonæ, and could not be wounded by the arrows of a mortal. Hercules boldly attacked the lion and strangled him. The second was to destroy the Learnæan hydra, which he accomplished with the aid of Iolaus; but because he obtained assistance in his work, Eurystheus refused to reckon it. Hercules's third labour was to catch the hind of Diana, famous for its swiftness, its golden horns, and brazen feet. The fourth was to bring alive to Eurystheus a wild boar, which ravaged the neighbourhood of Erymanthus. The fifth was to cleanse the stables of Augeas, king of Elis, where three thousand oxen had been confined for many years; which task he accomplished in one day, by turning the rivers Alpheus and Peneus through the stables. For certain reasons this exploit was not counted. His sixth was to destroy the carnivorous birds, with brazen wings, beaks, and claws, which ravaged the country near the lake Stymphalis, in Arcadia. The seventh was to bring alive to Peloponnesus a bull, remarkable for its beauty and strength, which Poseidon had given to Minos, king of Crete, in order that he might sacrifice it; which Minos refusing to do, Poseidon made the bull mad, and it laid waste the island. Hercules brought the bull on his shoulders to Eurystheus, who set it at liberty. The eighth labour was to obtain the mares of Diomedes, king of the Bistones, in Thrace, which fed upon human flesh. The ninth was to bring the girdle of Hippolyta, queen of the Amazons. The tenth was to kill the monster Geryon, and bring his herds to Argos. These were all the labours originally imposed on Hercules; but as Eurystheus acknowledged only eight of them, Hercules was commanded to perform two more. The eleventh labour was to obtain the golden apples from the garden of the Hesperides. Atlas, who knew where to find the apples, brought them to Hercules, who meantime supported the vault of heaven. The last labour was to bring from the infernal regions the three-headed dog Cerberus. When Hercules brought the dog to Eurystheus, the latter, pale with fright, ordered him to be set at