In Greek mythology, Pollux was the nickname of Polydeuces, the son of Zeus and Leda and twin brother of Castor. See Castor and Polydeuces.

Leda was the wife of Tyndareus, King of Sparta. Zeus, King of the Gods, came to her in the form of a swan. He seduced the human queen, and she became pregnant by him. When the time came, she bore four children, two from the union with Zeus, an immortal, and two by her mortal husband, King Tyndareus, all from one large, blue egg.

The children born out of the egg that day were two sons and two daughters, Castor and Pollux, and Clytemnestra and Helen. Being the offspring of Zeus, Pollux and Helen were immortal twins. Though born on the same day, their half-siblings, the mortal children of Tyndareus, Castor and Clytemnestra, are not their true twins, thouhg mythology overwhelmingly presents them as such.

As the young Pollux grew, he became inseparable from his half-brother Castor. They became renowned, in due time, as great horsemen, though Castor was known as the better of the two. Pollux, meanwhile also gained much fame as a great boxer, being both strong and able.

The two young men volunteered to go on the Argosy, a voyage to help Jason retreive the Golden Fleece.

Pollux | Polydeukes | Polluce | Polydeukes | Pollux | Polydeuces