On either side of this long frieze [The Triumph of Dionysos] there are two small and rather incongruous panels depicting the Dioscouroi, Castor and Pollux. These were the mythical twins that hatched from one of the eggs laid by Leda after her union with Zeus disguised as a Swan (Helen of Troy came out of the other one). They both wear military clothes and hold the reins of a horse that stands behind them. With the other hand they hold a spear. They wear wreaths and a star stands above their heads. The Dioscouroi were endowed with prophylactic powers and were probably put here in order to ward off evil and bring good fortune.