Some scholars believe that behind Heracles' complicated mythology there was probably a real man, perhaps a chieftain-vassal of the kingdom of Argos. Some scholars suggest the story of Heracles is an allegory for the sun's yearly passage through the twelve constellations of the zodiac. Others point to earlier myths from other cultures, showing the story of Heracles as a local adaptation of hero myths already well established.
Traditionally, Heracles was the son of Zeus and Alcmene, granddaughter of Perseus. His fantastic solitary exploits, with their many folk-tale themes, provided much material for popular legend. He is portrayed as a sacrificier, mentioned as a founder of altars, and imagined as a voracious eater himself; it is in this role that he appears in comedy, while his tragic end provided much material for tragedy. In art and literature Heracles was represented as an enormously strong man of moderate height; his characteristic weapon was the bow but frequently also the club. Vase paintings demonstrate the unparalleled popularity of Heracles, his fight with the Nemean lion being depicted many hundreds of times.
Heracles also entered Etruscan and Roman mythology and cult, and the exclamation "mehercule" became as familiar to the Romans as "Herakles" was to the Greeks. In Italy he was worshipped as a god of merchants and traders, although others also prayed to him for his characteristic gifts of good luck or rescue from danger.
Heracles attained the highest social prestige through his appointment as official ancestor of the Dorian kings. This probably served as a legitimation for the Dorian migrations into the Peloponnese. Hyllus, the eponymous hero of one Dorian phyle, became the son of Heracles and one of the Heracleidae or Heraclids (the numerous descendants of Heracles, especially the descendants of Hyllus - other Heracleidae included Macaria, Lamos, Manto, Bianor, Tlepolemus, and Telephus). These Heraclids conquered the Peloponnesian kingdoms of Mycenae, Sparta and Argos, claiming, according to legend, a right to rule them through their ancestor. Their rise to dominance is frequently called the "Dorian invasion". The Lydian and later the Macedonian kings, as rulers of the same rank, also became Heracleidae.
Heracles is best known for his 12 labours. The story starts in Thebes where 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, 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. Those 12 labours were the following:
- Slay the Nemean Lion
- Slay the nine-headed Lernaean Hydra
- Capture the Golden Hind of Artemis
- Capture the Erymanthian Boar
- Clean the Augean stables in a single day
- Slay the Stymphalian Birds
- Capture the Cretan Bull
- Steal the Mares of Diomedes
- Obtain the girdle of Hippolyta, Queen of the Amazons
- Obtain the cattle of the monster Geryon
- Steal the apples of the Hesperides
- Capture and bring back Cerberus
Read more about Heracles here: The life and labours of Heracles, the protector of mankind