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Chapter 19- the trojan saga and the illiad. Leda, wife of the king of sparta bore four children to zeus who visited her in the shape of a swan; the four were born from two eggs-from the one sprang polydeuces and helen, from the other, The legends of the discouri, sons of zeus, castor and polydeuces (pollux) are not part of the saga of the trojan war. Castor was renowned as a tamer of horses and polydeuces for his skill in boxing. Poly was the immortal son of zeus whereas castor was the mortal son of the king of. Sparta who eventually shared the immortality of his brother. They were perhaps mortal heroes, later worshipped as gods. When castor was hurt and lay dying, zeus gave him the option of living with castor but spending alternate days on olympus and in hades, which he chose.