According to the legend, the twin heroes Dioskouri, Castor and Polydeukis
Were born on Taygetus, the great mountain of Sparta and Tainarus, so they are preeminently heroes of Doric origin. In Sparta, the king of Tyndareus, had for his wife the beautiful Leda, daughter of the king of Aetolia, Thestius. Leda married Zeus and had two children with him, Helen, who was as beautiful as a goddess, and Polydeukis, the heroic hero. With King Tyndareus, Leda had two more children, Clytemnestra and Castor.
Polydeuces received immortality from his father the god Zeus, but his brother, Castor, remained mortal, because he was the son of the mortal king. They both became big and jerks, no one could go wrong with Castor, in his skill in driving the chariot, where he managed to tame even the most unruly horses. And Polydevkis was a brave boxing champion. The two were never separated from each other because they were united by fiery love.
The Dioscuri took part in many great exploits of the Greek heroes, took part in the Argonautic Campaign and distinguished themselves especially against the king of the Bevryks, Amykus, who was defeated by Polydeukis, thus putting all the Bevryks to flight. When Theseus and Peirithus descended to the Underworld to seize Persephone, the Dioscuri launched a campaign against Athens, claiming their sister Helen, whom Theseus had abducted and imprisoned in the Aphidna fortress in Laconia. So, while Theseus was away, they freed their sister and took Theseus’s mother, Aithra, captive in Sparta. In addition, they removed the sons of Theseus from the throne of Athens and replaced them with the claimant to the kingdom, Menesthea.
Before they could even get out of hiding, Idas threw his pole into the tree and seriously injured Castor. Polydeukis smiled at them. The Afarides could not deal with him and put him to death. Polydeukis reached them somewhere near the grave of their parents. He killed Lygeus and began to fight, for life or death, with Ida. The mighty Zeus then intervened to stop the battle, throwing a bolt of lightning that reduced both Ida and the corpse of Lygeus to ashes.
Polydeukis turned to where Castoras lay mortally wounded and wept bitterly as if he saw death separating them. He begged his father Zeus to let him die with his beloved brother. Zeus then appeared to his son and made him choose: Either live forever young among the bright gods of Olympus, or live forever with his brother one day in the gloomy realm of Hades, and the next in Olympus. Polydevkis did not want to be separated from his brother. And so he shared his fate.
Since then, these two brothers wander one day in the dark plains of the kingdom of Hades and the next, live with the gods in the palaces of the leader of the gods, Zeus.
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