In Greek and Roman myth, Caster (Kastor) and Pollux (Polydeukes) are twin brothers the sons of Zeus and Leda, Queen of Sparta (the wife of King Tyndareus) they they were apotheosed into gods at death.
At first Polydeukes alone, being a son of Zeus, was offered this gift, but he agreed only on condition that his half-twin Kastor share the honour. Zeus assented, but the pair had to spend alternate days in Haides to appease the Fates and the Gods of the Dead.
The Dioskouroi also received a place amongst the stars as Gemini (the Twins).
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Castor and Pollux
Pollux and Castor were gods that represented death and life/immortality.
Leda was the daughter of King Thestius, and the wife of King Tyndareus. The god Zeus (Jupiter in Roman mythology) appeared to her as a swan, and seduced her. Since she also slept with her husband, two of her children were mortal, and two were immortal. They were also hatched from eggs. Her children were Helen (better known as the beautiful Helen of Troy), Clytemnestra, Castor and Pollux (also known as Polydeuces). Between Castor and Pollux, Pollux was usually the immortal one.
Leda daughter of Thestius and Laophohte or Eurythemis or Deidameia: she was Queen of Sparta, with her husband Tyndareus she had Castor with Zeus she had Pollux - though the boys are twins (born at the same time, different fathers).
Leda, who was also mother to Polydeuces (Pollux), Helen of Troy and Clytemnestra.