Pollux (POL-uks). Roman name of Polydeuces, one of the Dioscuri or Hero Twins. Polydeuces was considered godly enough to be admitted to the divine court on Mount Olympus, while his brother was sent to Hades as a mere mortal. But Polydeuces could not bear eternal separation, so the gods allowed the twins to remain together forever, spending half the year in the Underworld and the other half on Olympus. It is under his Roman name that Polydeuces is memorialized together with his brother as the constellation Castor and Pollux.