Castor is a prominent figure in Greek mythology, known as one of the twin brothers in the pair known as the Dioscuri. He is often associated with horsemanship and is considered a protector of sailors. Castor and his brother Pollux were said to have been born from the same mother, Leda, but had different fathers, which contributed to their unique identities. In addition to his mythological significance, Castor is also recognized in astronomy. The name Castor refers to one of the brightest stars in the constellation Gemini, which represents the twins. This star system is notable for its multiple components, showcasing the duality that Castor embodies in both mythology and the cosmos.