Castor and Pollux are two characters from Greek mythology. They were twin brothers, sons of Zeus and Leda, and were known as the Dioscuri. CASTOR was a skilled horseman and Pollux was an expert boxer. Together, they were known for their bravery and loyalty to each other. CASTOR was mortal, while Pollux was immortal. In some versions of the myth, CASTOR was killed in battle, and Pollux asked Zeus to make him immortal so that they could remain together.