Capricornus's father, Cronos heard that his son would eventually kill him so he killed all his sons. But Zeus's mother gave Capricornus and Zeus to the sea people to protect them. Amalthea a goat raised them both, which is why Capricornus is half goat. Zeus eventually became stronger and killed Capricornus's father. He placed Capricornus in the sky to honor Amalthea.