Greek Mythology

Heracles

Youth
After killing his music tutor Linus with a lyre, he was sent to tend cattle on a mountain by his foster father Amphitryon. Here, according to an allegorical parable, "The Choice of Heracles", invented by the sophist Prodicus (c. 400 BCE) and reported in Xenophon's Memorabilia 2.1.21–34, he was visited by two allegorical figures—Vice and Virtue—who offered him a choice between a pleasant and easy life or a severe but glorious life: he chose the latter. This was part of a pattern of "ethicizing" Heracles over the 5th century BCE.
Later in Thebes, Heracles married King Creon's daughter, Megara. In a fit of madness, induced by Hera, Heracles killed his children by Megara. After his madness had been cured with hellebore by Antikyreus, the founder of Antikyra,[16] he realized what he had done and fled to the Oracle of Delphi. Unbeknownst to him, the Oracle was guided by Hera. He was directed to serve King Eurystheus for ten years and perform any task Eurystheus required of him. Eurystheus decided to give Heracles ten labours, but after completing them, Heracles was cheated by Eurystheus when he added two more, resulting in the Twelve Labors of Heracles.

Labours of Heracles
Driven mad by Hera, Heracles slew his own children. To expiate the crime, Heracles was required to carry out ten 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' nephew, Iolaus, had helped him burn the stumps of the heads. Eurystheus 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.
The 12 labours of Heracles :

1.Slay The Nemean Lion
According to one version of the myth, the Nemean lion took women as hostages to its lair in a cave near Nemea, luring warriors from nearby towns to save the damsel in distress. After entering the cave, the warrior would see the woman (usually feigning injury) and rush to her side. Once he was close, the woman would turn into a lion and kill the warrior, devouring his remains and giving the bones to Hades.
Hercules wandered the area until he came to the town of Cleonae. There he met a boy who said that if Hercules slew the Nemean lion and returned alive within thirty days, the town would sacrifice a lion to Zeus, but if he did not return within thirty days or he died, the boy would sacrifice himself to Zeus. Another version claims that he met Molorchos, a shepherd who had lost his son to the lion, saying that if he came back within thirty days, a ram would be sacrificed to Zeus. If he did not return within thirty days, it would be sacrificed to the dead Hercules as a mourning offering.
While searching for the lion, Hercules fletched some arrows to use against it, not knowing that its golden fur was impenetrable. When he found and shot the lion, firing at it with his bow, he discovered the fur's protective property as the arrow bounced harmlessly off the creature's thigh. After some time, Hercules made the lion return to his cave. The cave had two entrances, one of which Hercules blocked; he then entered the other. In those dark and close quarters, Hercules stunned the beast with his club and, using his immense strength, strangled it to death. During the fight the lion bit off one of his fingers. Others say that he shot arrows at it, eventually shooting it in the unarmored mouth. After slaying the lion, he tried to skin it with a knife from his belt, but failed. He then tried sharpening the knife with a stone and even tried with the stone itself. Finally, Athena, noticing the hero's plight, told Hercules to use one of the lion's own claws to skin the pelt. Others say that Hercules' armor was, in fact, the hide of the lion of Cithaeron.
When he returned on the thirtieth day carrying the carcass of the lion on his shoulders, King Eurystheus was amazed and terrified. Eurystheus forbade him ever again to enter the city; in future he was to display the fruits of his labours outside the city gates. In future, Eurystheus told Hercules his tasks through a herald, not personally. Eurystheus even had a large bronze jar made for him in which to hide from Hercules if need be. Eurystheus then warned him that the tasks set for him would become increasingly difficult.