As Ovid has here cursorily taken notice of the labours of Hercules, we may observe, that it is very probable that his history is embellished with the pretended adventures of many persons who bore his name, and, perhaps, with those of others besides. Cicero, in his 'Treatise on the Nature of the Gods,' mentions six persons who bore the name of Hercules; and possibly, after a minute examination, a much greater number might be reckoned, many nations of antiquity having given the name to such great men of their own as had rendered themselves famous by their actions. Thus, we find one in Egypt in the time of Osiris, in Phoenicia, among the Gauls, in Spain, and in other countries. Confining ourselves to the Grecian Hercules, surnamed Alcides, we find that his exploits have generally been sung of by the poets, under the name of the Twelve Labours; but, on entering into the detail of them, we find them much more numerous. Killing some serpents in his youth, it was published, not only that he had done so, but that they had been sent by Juno for the purpose of destroying him. The forest of Nemea serving as a retreat for a great number of lions that ravaged the country, Hercules hunted them, and, killing the most furious of them, always wore his skin.
Several thieves, having made the neighbourhood of Lake Stymphalus, in Arcadia, their resort, he freed the country of them; the nails and wings which the poets gave them, in representing them as birds, being typical of their voracity and activity. The marshes of Lerna, near Argos, were infested by great numbers of serpents, which, as fast as they were destroyed, were replaced by new swarms; draining the marshes, and, probably, setting fire to the adjacent thickets or jungles, he destroyed these pestilent reptiles, on which it was fabled that he had destroyed the Hydra of Lerna, with its heads, which grew as fast as they were cut off. The forest of Erymanthus was full of wild boars, which laid waste all the neighbouring country: he destroyed them all, and brought one with him to the court of Eurystheus, of a size so monstrous, that the king was alarmed on seeing it, and was obliged to run and hide himself.
The stables of Augeas, king of Elis, were so filled with manure, by reason of the great quantity of oxen that he kept, that Hercules being called upon to cleanse them, employed his engineering skill in bringing the river Alpheus through them. Having pursued a hind for a whole year, which Eurystheus had commanded him to take, it was circulated, probably on account of her untiring swiftness, that she had feet of brass. The river Acheloüs having overflowed the adjacent country, he raised banks to it, as already mentioned. Theseus was a prisoner in Epirus, where he had been with Pirithous, to bring away the daughter of Aidoneus. Hercules delivered him; and that was the foundation of the Fable which said that he had gone down to Hades, or Hell. In the cavern of Tænarus there was a monstrous serpent; this he was ordered to kill, and, probably, this gave rise to the story of Cerberus being chained by him. Pelias having been killed by his daughters, his son Acastus pursued them to the court of Admetus, who, refusing to deliver up Alcestis, of whom he was enamoured, was taken prisoner in an engagement, and was delivered by that princess, who herself offered to be his ransom. Hercules being then in Thessaly, he took her away from Acastus, who was about to put her to death, and returned her to Admetus. This, probably, was the foundation of the fable which stated, that he had recovered her from the Infernal Regions, after having vanquished death, and bound him in chains.