The Temple of Castor and Pollux, located in the square of ancient Rome, was originally built by the Roman Republic to defeat the Latin Union in the battle of Lake Regilus (495 years ago). Castor and Pollux were twins of ancient Greek mythology Zeus and Leda, Queen of Sparta. They were introduced into Rome from Greek culture. According to legend, Castor and Pollux appeared on the battlefield as two knights who helped the Republic. After the victory of the battle, the war dictators of the Roman Republic, Olus Postumus Albus Regillences, built this temple to thank the son of Zeus. Later, the temple was used for other purposes many times. It was abandoned in the fourth century A.D. and left only three pillars after the fifteenth century.