Tyndareus

In Greek mythology, Tyndareus (or Tyndareos) was a Spartan king, son of Oebalus (or Perieres) and Gorgophone (or Bateia), husband of Leda and father of Helen, Polydeuces (Pollux), Castor,  Clytemnestra, Timandra, Phoebe and Philonoe.Tyndareus' wife, Leda, was seduced by Zeus, who disguised himself as a swan. She laid two eggs, each producing two children. According to the usual version, from one egg, Pollux and Helen were the children of Zeus; from the other, Castor and Clytemnestra were the children of Tyndareus.Tyndareus had a brother named Hippocoon, who seized power and exiled Tyndareus. He was reinstated by Heracles, who killed Hippocoon and his sons, including Lycon. Tyndareus's other brother was Icarius, who became the father of Penelope.
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[Greek heroic] The king of Sparta, husband of Leda, father of the Dioscuri, Clytemnestra, and Helen. His brother Hippocoon banished him from Sparta, but he was restored to power by Heracles. Because he had no children who could ascend to the throne (the Dioscuri had been given a place among the gods), he gave his realm to his son-in-law Menelaus.

Tyndareus A king in Lacedaemon, expelled and received by King Thestios of Aetolia, by whose daughter Leda he becomes father of the Dioscuri or Tyndaridae, Castor and Pollux. In some accounts both these children are the offspring of Zeus, in others Pollux only, and in still others both are sons of Tyndareus. Most commonly Leda is considered the bride of both Zeus and Tyndareus, and the result of this double union was the birth of Polydeuces (or Pollux) and Helena, later Helen of Troy, who were the children of Zeus, and of Castor and Clytemnestra, the children of Tyndareus. See also DIOSCURI