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The Disocuri were Castor and Pollux (or Polydeuces), the twin sons of Leda and brothers of Helen of Troy. The twins shared the same mother but had different fathers. Pollux, the son of Zeus, was immortal but Castor was mortal. When Castor died, Pollux asked to let him share his own immortality with his twin to keep them together. They were transformed into the Gemini constellation and the two spend alternate days on Olympus (as gods) and in Hades (as deceased mortals). The pair were regarded as the patrons of sailors, to whom they appeared as St. Elmo's fire.