The story of Gemini has relation to the bastard of Zeus, Pollux.

One time, Zeus was attracted by the pretty figure of the queen of Sparta. He changed into a swan and met with her. Later, the queen gave birth to twins, Pollux and Caster. Yet only Pollux possessed the blood relationship of Zeus, and Caster did not.

Though these two brothers were uterine, yet they have good emotions for each other. They did everything together and did not leave each other from childhood. It was a little different from their abilities. Caster was good at horsemanship; but Pollux was good at swordsmanship and boxing. When they cooperated, the power will be doubled. In the battles, they build many great merits.

Both they liked to take a risk for everywhere. They had never to lose a battle. But unfortunately, they met another twins. After fighting, Pollux wan but Caster. Pollux was very sad and couldn’t stand the pin of losing brother. So he asked Zeus give his life to his brother. Zeus was touched by their love of brother. Therefore he mad them sharing half of the life together. They appeared in the winter and disappeared in the summer. And later, Zeus made their images becoming the constellation in the sky.