His name was Glaucus. I love that book!
Castor is brother of Polydeuces (Pollux)
Leda, who was also mother to Polydeuces (Pollux), Helen of Troy and Clytemnestra.
The wives of the Dioscuri were the Leucippides; Phoibe (who married Polydeuces/Pollux)and Hilaeira (who married Castor). Hilaeira had with Castor: Anogon/Anaxis Phoibe had with Pollux: Mnesileos/Mnasinous
Helen of Troy sister to Castor and Polydeuces.
Castor and Pollux or Polydeuces (depending if you read the Latin version or the Greek version)
Castor and Polydeuces, twin sons of Zeus who were transferred to the stars upon their death.
helen clytemnestra Ione castor polydeuces glaucus milo atlanta prince meleager the pythia/eunike Lord tyndareus and the queen theseus of athens lord oeneus and the queen aegisthus lord thyestes prince tantalus
Leda, Queen of Sparta. Her children are: Castor and Polydeuces; Helen and Clytaimnestra. Castor and Clytaimnesta being the children of her husband Tyndareus.
In Greek and Roman mythology, Castor and Pollux (who was also called Polydeuces), were twin brothers who were both the sons of Leda, but Castor was the mortal son of Tyndareus and Pollux was the son of Zeus. Yes, twin sons with different fathers.
Leda was the Queen of Sparta who was married to King Tyndareus, her children were; Helen Polydeuces Clytemnestra Castor
Castor and Pollux or Polydeuces were twin brothers, together known as the Dioscuri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux the divine son of Zeus, when Castor was killed, Pollux asked Zeus to let him share his own immortality with his twin to keep them together, and they were transformed into the constellation Gemini.
The Greeks saw Gemini as two twins, Castor and Pollux, who were both mothered by Leda, but had different fathers, as Leda was made pregnant in the same night by Zeus and her husband. So, Pollux was immortal, whereas Castor was mortal. They both had their talents; Pollux was strong, and Castor was good with horses. They both voyaged in search of the Golden Fleece (which is kind of similar to the Holy Grail). Afterwards, they both fought in the Trojan War to bring their sister, Helen, back to her husband. Pollux was devastated when Castor died, and asked Zeus to let Castor share his immortality. Zeus agreed, and they were reunited in the night sky, forever together.