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")
Pollux (mountain) The first winter and ski ascent of Pollux was by Dr Alfred von Martin and Karl Planck on 7 March 1913. There are also a pair of summits named Pollux and Castor in Yellowstone National Park in Wyoming, USA. Located in the Absaroka Range, Pollux is 3,373 m, 65 m higher than its twin. Pollux (mountain) Pollux () is a mountain in the Pennine Alps on the border between Valais, Switzerland and the Aosta Valley in Italy. It is the lower of a pair of twin peaks (), the other being Castor, named after the Gemini twins of Roman mythology.