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In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioscuri. Their mother was Leda, but Castor was the mortal son of Tyndareus, king of Sparta, and Pollux the divine son of Zeus, who visited Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg, along with their twin sisters Helen of Troy and Clytemnestra.
When Castor was killed, Pollux asked Zeus to let him share his own immortality with his twin to keep them together, and they were transformed into the constellation Gemini. The pair were regarded as the patrons of sailors, to whom they appeared as St. Elmo's fire, and were also associated with horsemanship.
The best-known story of the twins' birth is that Zeus disguised himself as a swan and raped Leda. Thus Leda's children are frequently said to have hatched from two eggs that she then produced. The Dioscuri can be recognized in vase-paintings by the skull-cap they wear, the pilos, which was explained in antiquity as the remnants of the egg from which they hatched. Tyndareus, Leda's mortal husband, is then father or foster-father to the children. Whether the children are thus mortal and which half-immortal is not consistent among accounts, nor is whether the twins hatched together from one egg. In some accounts, only Polydeuces was fathered by Zeus, while Leda and her husband Tyndareus conceived Castor. This explains why they were granted an alternate immortality. It is a common belief that one would live among the gods, while the other was among the dead. The figure of Tyndareus may have entered their tradition to explain their archaic name Tindaridai in Spartan inscriptions or in literature Tyndaridai, in turn occasioning incompatible accounts of their parentage.
Castor and Polydeuces are sometimes both mortal, sometimes both divine. One consistent point is that if only one of them is immortal, it is Polydeuces. In Homer's Iliad, Helen looks down from the walls of Troy and wonders why she does not see her brothers among the Achaeans. The narrator remarks that they are both already dead and buried back in their homeland of Lacedaemon, thus suggesting that at least in some early traditions, both were mortal. Their death and shared immortality offered by Zeus was material of the lost Cypria in the Epic cycle.
The Dioscuri were regarded as helpers of mankind and held to be patrons of travellers and of sailors in particular, who invoked them to seek favourable winds. Their role as horsemen and boxers also led to them being regarded as the patrons of athletes and athletic contests. They characteristically intervened at the moment of crisis, aiding those who honoured or trusted them.
Both Dioscuri were excellent horsemen and hunters who participated in the hunting of the Calydonian Boar and later joined the crew of Jason's ship, the Argo.
During the expedition of the Argonauts, Pollux took part in a boxing contest and defeated King Amycus of the Bebryces, a savage mythical people in Bithynia. After returning from the voyage, the Dioskouroi helped Jason and Peleus to destroy the city of Iolcus in revenge for the treachery of its king Pelias.
When their sister Helen was abducted by the legendary Greek king Theseus, they invaded his kingdom of Attica to rescue her, abducting Theseus' mother Aethra in revenge and carrying her off to Sparta while setting a rival, Menestheus, on the throne of Athens. Aethra was forced to become Helen's slave but was eventually returned to her home by her grandsons Demophon and Acamas following the fall of Troy.
Castor and Pollux aspired to marry the Leucippides ("daughters of the white horse"), Phoebe and Hilaeira, whose father was a brother of Leucippus ("white horse"). Although both women were already betrothed to counterpart twin brothers of Thebes, Lynceus and Idas, sons of Aphareus, Castor and Pollux carried them off to Sparta, where Phoebe bore Mnesileos to Pollux and Hilaeira bore Anogon to Castor. This began a feud among the four cousins.
The cousins carried out a cattle-raid in Arcadia together but fell out over the division of the meat. After stealing the herd, but before dividing it, the cousins butchered, quartered, and roasted a calf. As they prepared to eat, the gigantic Idas suggested that the herd be divided into two parts instead of four, based on which pair of cousins finished their meal first. Castor and Pollux agreed. Idas quickly ate both his portion and Lynceus' portion. Castor and Pollux had been duped. They allowed their cousins to take the entire herd, but vowed to someday take revenge.
Some time later, Idas and Lynceus visited their uncle's home in Sparta. The uncle was on his way to Crete, so he left Helen in charge of entertaining the guests, which included both sets of cousins, as well as Paris, prince of Troy. Castor and Pollux recognized the opportunity to exact revenge, made an excuse that justified leaving the feast, and set out to steal their cousins' herd. Idas and Lynceus eventually set out for home, leaving Helen alone with Paris, who then kidnapped Helen. Thus, the four cousins helped set into motion the events that gave rise to the Trojan War.
Meanwhile, Castor and Pollux had reached their destination. Castor climbed a tree to keep a watch as Pollux began to free the cattle. Far away, Idas and Lynceus approached. Lynceus, named for the lynx because he could see in the dark, spied Castor hiding in the tree. Idas and Lynceus immediately understood what was happening. Idas, furious, ambushed Castor, fatally wounding him with a blow from his spear—but not before Castor called out to warn Pollux. In the ensuing brawl, Pollux killed Lynceus. As Idas was about to kill Pollux, Zeus, who had been watching from Mt. Olympus, hurled a thunderbolt, killing Idas and saving his son.
Returning to the dying Castor, Pollux was given the choice by Zeus of spending all his time on Mount Olympus or giving half his immortality to his mortal brother. He opted for the latter (so giving half his immortality to Castor), enabling the twins to alternate between Olympus and Hades. The brothers became the two brightest stars in the constellation Gemini ("the twins"): Castor (Alpha Geminorum) and Pollux (Beta Geminorum). As emblems of immortality and death, the Dioscuri, like Heracles, were said to have been initiated into the Eleusinian mysteries.
© 2003-2022 Dmitry Karasyuk. Idea, preparation, drawing up