The four columns erected on the site of the temple of Castor and Pollux are a modern (and incorrect) restoration in which portions of two buildings have been used.
He has ever been the patron saint of Mediterranean sailors, who regard St Elmo's fire as the visible sign of his guardianship. The phenomenon was known to the ancient Greeks, and Pliny in his Natural History states that when there were two lights sailors called them Castor and Pollux and invoked them as gods.
It fronted on to the ancient forum, part of the pavement of which, with a base for the equestrian statues of Castor and Pollux (as the inscription upon it records) has been laid bare beneath the present Piazza Vittorio Emanuele.
In 1842-1849, King Louis built himself to the west of the town a country house, called the Pompeianum, from its being an imitation of the house of Castor and Pollux at Pompeii.
Fabius Maximus Rullianus to commemorate the miraculous intervention of Castor and Pollux at the battle' of Lake Regillus.