Castor and Pollux Castor and Pollux Castor and Pollux (or in Greek, Polydeuces) were twin half-brothers in Greek and Roman mythology, known together as the Dioscuri. Their mother was Leda, but they had different fathers; Castor was the mortal son of Tyndareus, the king of Sparta, while Pollux was the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg, along with their twin sisters Helen of Troy and Clytemnestra. In Latin the twins are also known as the Gemini (literally "twins")
Castor (mountain) Castor (mountain) Castor () is a mountain in the Pennine Alps on the border between Valais, Switzerland and the Aosta Valley in Italy. It is the higher of a pair of twin peaks (), the other being Pollux, named after the Gemini twins of Roman mythology. Castor's peak is at an elevation of , and it lies between Breithorn and the Monte Rosa. It is separated from Pollux by a pass at , named "Passo di Verra" in Italian and "Zwillingsjoch" in German. Ascents are usually made from the alpine hut "Capanna Quintino Sella" on the Italian side, by means