Castor and Pollux (Twins)
heroThe twin brothers of Helen — one mortal, one divine — who shared immortality by alternating between Olympus and Hades.
The Myth
Castor and Pollux (Polydeuces in Greek) were twin brothers born to Leda, but with different fathers: Pollux was the son of Zeus, who came to Leda as a swan, while Castor was the son of her mortal husband Tyndareus. This made Pollux immortal and Castor mortal — a difference that became tragically relevant. The twins were inseparable: Castor was the supreme horseman, Pollux the undefeated boxer. They sailed with the Argonauts, rescued Helen from Theseus, and fought in the Calydonian Boar Hunt. But in a cattle raid against their cousins Idas and Lynceus, Castor was killed. Pollux, devastated, begged Zeus to let him die too rather than live without his brother. Zeus offered a compromise: the twins would alternate, spending one day on Olympus and the next in Hades. They became the constellation Gemini, and sailors prayed to them during storms — the phenomenon of St. Elmo's fire was thought to be their presence on the mast.
Fun Fact
St. Elmo's fire — the electrical glow on ships' masts during storms — was believed to be Castor and Pollux protecting sailors.
Words We Inherited
English words and phrases that trace back to this myth:
Explore Further
Leda
heroLeda was the queen of Sparta who was seduced by Zeus in the form of a swan and bore two eggs — from...
Lynceus (Argonaut)
heroThe Argonaut with superhuman eyesight who could see through the earth and beneath the sea, serving...
Lynceus the Argonaut
heroArgonaut famed for supernatural eyesight so sharp he could see through solid earth and spot objects...
Idas
heroStrongest of the Argonauts, who kidnapped his bride from Apollo and later died fighting the...
Argonauts
conceptThe Argonauts were the band of heroes who sailed with Jason on the Argo to retrieve the Golden...
Helen
heroThe most beautiful woman in the world, daughter of Zeus. Her elopement with Paris of Troy triggered...
Helen of Troy
heroHelen was the most beautiful woman in the world, daughter of Zeus and Leda, whose abduction by...
Theseus
heroThe hero who navigated the Labyrinth, slew the Minotaur, and became the legendary king of Athens....
Theseus (Athenian)
heroTheseus was the great hero of Athens who slew the Minotaur, united Attica, and established Athenian...
Theseus (Labyrinth)
heroAthenian prince who entered the Cretan Labyrinth, killed the Minotaur with Ariadne's help, then...
Theseus (King of Athens)
heroThe hero who killed the Minotaur and later united Attica under Athens, becoming the mythological...
Dioscuri
heroThe Dioscuri were twin brothers — Castor (mortal) and Pollux (divine) — inseparable in life, who...