Castor and Pollux are twin brothers in Greek and Roman mythology, known as the Dioscuri. They are often associated with horsemanship and are considered protectors of sailors. Castor is a skilled horseman, while Pollux is a boxer and has divine parentage, being the son of Zeus. The twins are famous for their close bond and adventures together, including their participation in the Argonauts expedition. They are also represented in the night sky as the constellation Gemini, symbolizing their enduring connection even after death, as they were granted the ability to alternate between Olympus and the underworld.