Castor and Pollux were twin brothers, the sons of Zeus and Leda, the wife of Tyndarus, king of Sparta.
They sailed with Jason and the Argonauts in search of the Golden Fleece.
They were invincible fighters with unparalleled courage. Pollux distinguished himself as a great boxer or fighter and Castor as a great wrestler.
Castor was a great horseman. These two were inseparable companions and fought their best when they were near each other.
Because of the help they gave their fellow Argonauts during a storm which threatened to sink their ship, the constellation Gemini was considered a favorable sign to sailors when they saw it.
To commemorate their great feats and the help they gave to the sailors, and because of their great love for each other, Zeus placed their constellation, Gemini, in the sky after their deaths. Today, Gemini can be seen between the constellations of Orion and Cancer, near Leo.