St. Elmo's fire is a natural phenomenon that occurs during certain stormy weather conditions. It appears as a glow on the top of tall pointed objects, such as the masts of ships, and is often accompanied by a cracking noise. When stars appeared on the heads of Castor and Pollux during the voyage of the Argonauts, the twins became known as the protectors of sailors. From that time, sailors believed that St. Elmo's fire was actually Castor and Pollux coming to protect them during a storm.
And Lynceus. Castor and Pollux carried the women away to Sparta, pursued by their male cousins. In the fight that followed, the twins succeeded in killing both Idas and Lynceus, but Castor was fatally wounded.
In another version of this story, the four men conducted a cattle raid together. Idas and Lynceus then tried to cheat Castor and Pollux out of their share of the cattle. The twins decided to take the cattle themselves, but were caught as they started to sneak away. A fight broke out in which Castor, Idas, and Lynceus were all killed.
This story also has several different endings. In one, Castor’s spirit went to Hades, the place of the dead, because he was a human. Pollux, who was a god, was so devastated at being separated from his brother that he offered to share his immortality (ability to live forever) with Castor, or to give it up so that he could join his brother in Hades. Taking pity on his son Pollux, Zeus declared that the brothers would take turns dwelling in Hades and with the gods on Mount Olympus. On one day, Castor would be with the gods and Pollux would be in Hades; on the next, the two would change places. In another ending, Castor remained in Hades, but Pollux was allowed to visit him every other day. Most versions of the myth say that Zeus placed the brothers in the heavens as part of the constellation—group of stars—known as Gemini. Today the two brightest stars in the constellation Gemini are named Castor and Pollux.