The Myth (original)

Hercules, on Zeus' order, was forced to promise obedience to the power of King Eurystheus because of something he did and was not his fault but Heras'.

After visiting the oracle of Delphi that was dedicated to Apollo, the Pythia priestess told him that he must serve for 12 years under Eurystheus orders who was his cousin and King of Tiryns and Mycenae.

By birthright Hercules should have been King himself, but Hera had tricked Zeus into crowning Eurystheus instead. When Hercules was about to be born, Zeus declared that a descendant of Perseus, then about to be born, would be king of Mycenae. But Hera, out of jealousy, persuaded Ilithyia, goddess of childbirth, to retard Alcmena's delivery, and contrived that Eurystheus, also a descendant of Perseus, should be born a seven-month child.
This is how Hercules lost the throne of Mycenae.

Hercules was now sentenced to serving Eurystheus for twelve years and to perform a series of ten tasks or "ten labors" which became twelve because he did not acknowledge two of his labors. By accomplishing those labors he would become immortal. So Hercules as a disciple who takes orders from his soul, undertook the twelve labors accomplishing each one within a different zodiac sign. This is why Hercules represents any disciple who asks to walk on the path of light.

His birth name was Alcedes that later changed to Heracles (Hercules) before his labors. The name Heracles means "Glory of Hera".

Hera represents the soul, so his name embodies his mission which was to reveal with active service on the physical level, the glory and power of his innate Divinity.