The story of Heracles (better know as Hercules) begins with his birth. Heracles was the son of the affair Zeus had with the mortal woman Alcmene. Zeus made love to her after disguising himself as her husband, Amphitryon, home early from war (Amphitryon did return later the same night, and Alcmene became pregnant with his son at the same time, a case of superfecundation, where a woman carries twins sired by different fathers). Thus, Heracles' very existence proved at least one of Zeus' many illicit affairs, and Hera often conspired against Zeus' mortal offspring, as revenge for her husband's infidelities. His twin mortal brother, son of Amphitryon was Iphicles, father of Heracles' charioteer Iolaus.
On the night the twins Heracles and Iphicles were to be born, Hera, knowing of her husband Zeus' adultery, persuaded Zeus to swear an oath that the child born that night to a member of the House of Perseus would be High King. Hera did this knowing that while Heracles was to be born a descendant of Perseus, so too was Eurystheus. Once the oath was sworn, Hera hurried to Alcmene's dwelling and slowed the birth of Heracles by forcing Ilithyia, goddess of childbirth, to sit crosslegged with her clothing tied in knots, thereby causing Heracles to be trapped in the womb. Meanwhile, Hera caused Eurystheus to be born prematurely, making him High King in place of Heracles. She would have permanently delayed Heracles' birth had she not been fooled by Galanthis, Alcmene's servant, who lied to Ilithyia, saying that Alcmene had already delivered the baby. Upon hearing this, she jumped in surprise, untying the knots and inadvertently allowing Alcmene to give birth to her twins, Heracles and Iphicles. A few months after he was born, Hera sent two serpents to kill him as he lay in his cot. Heracles throttled a snake in each hand and was found by his nurse playing with their limp bodies as if they were child's toys.
Driven mad by Hera, Heracles slew his own children. To expiate the crime, Heracles was required to carry out twelve labors set by his archenemy, Eurystheus, who had become king in Heracles' place. If he succeeded, he would be purified of his sin and, as myth says, he would be granted immortality. Heracles accomplished these tasks, but Eurystheus did not accept the cleansing of the Augean stables because Heracles was going to accept pay for the labor. Neither did he accept the killing of the Lernaean Hydra as Heracles' cousin, Ioloas, had helped him burn the stumps of the heads. Eurysteus set two more tasks (fetching the Golden Apples of Hesperides and capturing Cerberus), which Heracles performed successfully, bringing the total number of tasks up to twelve.
1. To kill the Nemean Lion.
2. To destroy the Lernaean Hydra.
3. To capture the Ceryneian Hind.
4. To capture the Erymanthian Boar.
5. To clean the Augean Stables.
6. To kill the Stymphalian Birds.
7. To capture the Cretan Bull.
8. To round up the Mares of Diomedes.
9. To steal the Girdle of Hippolyte.
10. To herd the Cattle of Geryon.
11. To fetch the Apples of Hesperides.
12. To capture Cerberus.
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