See more at Wikipedia.org...

[Greek] Polydeuces is a figure in Greek mythology. He is also the twin brother of Castor and the son of Zeus and Leda of Sparta, who was a mortal. He and Castor form the constellation Gemini. The twins were born from eggs after Zeus visited Leda as a swan. Since one parent was mortal and the other immortal, Castor became mortal whereas Polydeuces became immortal. Polydeuces was known as a boxer and won many Olympic events. He was also one of Jason's Argonauts on Jason's quest for the golden fleece. During the quest, Polydueces proved himself by killing an evil king and allowing the quest to continue. When the twins returned from the quest, they got in a dispute with two other men which was followed by a terrible battle. During this battle, Castor, the mortal, was killed. Polydeuces was terribly saddened by this and cried to his father Zeus. Zeus listened to Polydueces and decided to let Polydeuces and Castor spend alternate days on Olympus, home of the gods, and in the underworld. Zeus al...
Read more...

Dioscuri Dioskouroi (Greek) In Greek mythology, Castor and Pollux (Greek Polydeuces), Spartan twin sons of Tyndareus and Leda; their sisters were Helen and Clytemnestra. In Homer all but Helen were considered mortal, but after the twins' death they lived and died on alternate days. Later one, usually Pollox, was the son of Zeus and shared his immortality after Castor's death. Usually Zeus as a swan is said to have seduced Leda, who brought forth two eggs, one containing Helen and the other Castor and Pollox. The twins rescued Helen from Theseus and went with the Argonauts. Castor and Pollox are associated with the zodiacal sign Gemini, and sometimes with the morning and evening stars.
Originally they were seven cosmic gods, for in the days of Lemuria there were seven egg-born dioscuri or dhyani-chohans (agnishvatta-kumaras), who incarnated in the seven elect of the third root-race. These are identified with corybantes, curetes, dii magni, titans, etc. (SD 2:360-2). Later they were made into three and four, as male and female, the four being the four kabiri usually enumerated; and finally restricted, as were also the kabiri, to two.

See more at Wikipedia.org...

[Greek] Polydeuces is a figure in Greek mythology. He is also the twin brother of Castor and the son of Zeus and Leda of Sparta, who was a mortal. He and Castor form the constellation Gemini. The twins were born from eggs after Zeus visited Leda as a swan. Since one parent was mortal and the other immortal, Castor became mortal whereas Polydeuces became immortal. Polydeuces was known as a boxer and won many Olympic events. He was also one of Jason's Argonauts on Jason's quest for the golden fleece. During the quest, Polydueces proved himself by killing an evil king and allowing the quest to continue. When the twins returned from the quest, they got in a dispute with two other men which was followed by a terrible battle. During this battle, Castor, the mortal, was killed. Polydeuces was terribly saddened by this and cried to his father Zeus. Zeus listened to Polydueces and decided to let Polydeuces and Castor spend alternate days on Olympus, home of the gods, and in the underworld. Zeus al...
Read more...

Dioscuri Dioskouroi (Greek) In Greek mythology, Castor and Pollux (Greek Polydeuces), Spartan twin sons of Tyndareus and Leda; their sisters were Helen and Clytemnestra. In Homer all but Helen were considered mortal, but after the twins' death they lived and died on alternate days. Later one, usually Pollox, was the son of Zeus and shared his immortality after Castor's death. Usually Zeus as a swan is said to have seduced Leda, who brought forth two eggs, one containing Helen and the other Castor and Pollox. The twins rescued Helen from Theseus and went with the Argonauts. Castor and Pollox are associated with the zodiacal sign Gemini, and sometimes with the morning and evening stars.
Originally they were seven cosmic gods, for in the days of Lemuria there were seven egg-born dioscuri or dhyani-chohans (agnishvatta-kumaras), who incarnated in the seven elect of the third root-race. These are identified with corybantes, curetes, dii magni, titans, etc. (SD 2:360-2). Later they were made into three and four, as male and female, the four being the four kabiri usually enumerated; and finally restricted, as were also the kabiri, to two.