castor and pollux

plural noun Classical Mythology.

1. twin sons of Leda and brothers of Helen, famous for their fraternal affection and regarded as the protectors of persons at sea.

noun

1. classical myth the twin sons of Leda: Pollux was fathered by Zeus, Castor by the mortal Tyndareus. After Castor’s death, Pollux spent half his days with his half-brother in Hades and half with the gods in Olympus