Clytemnestra produced four offspring from two eggs: Castor and Clytemnestra from one egg, and Helen and Polydeuces (Pollux) from the other. Therefore, Castor and Clytemnestra were fathered by Tyndareus, whereas Helen and Polydeuces were fathered by Zeus. Agamemnon and his brother Menelaus were in exile at the home of Tyndareus; in due time Agamemnon married Clytemnestra and Menelaus married Helen. In a late variation, Euripides's "Iphigenia at Aulis", Clytemnestra's first husband was Tantalus, King of Pisa; Agamemnon killed him and Clytemnestra's infant son, then made Clytemnestra his wife. In another version, her first husband was King of Lydia. The kings of
Tyndareus Tyndareus In Greek mythology, Tyndareus (; Ancient Greek: Τυνδάρεος, "Tundáreos"; Attic: Τυνδάρεως, "Tundáreōs"; ) was a Spartan king. Tyndareus was the son of Oebalus (or Perieres) and Gorgophone (or Bateia). He married the Aetolian princess, Leda by whom he became the father of Castor, Clytemnestra, Timandra, Phoebe and Philonoe, and the stepfather of Helen of Troy and Pollux. Tyndareus had a brother named Hippocoon, who seized power and exiled Tyndareus. He was reinstated by Heracles, who killed Hippocoon and his sons. Tyndareus’ other brother was Icarius, the father of Penelope. Tyndareus’ wife Leda was seduced by Zeus, who disguised himself