|King of Sparta|
|Legendary King of Sparta|
|Issue|| Castor |
Helen of Troy  (stepdaughter)
|Father||Oebalus or Perieres|
In Greek mythology, Tyndareus ( /tɪnˈdɛriəs/ ; Ancient Greek: Τυνδάρεος, Tundáreos; Attic: Τυνδάρεως, Tundáreōs; [tyndáreɔːs] ) 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 as a swan. She laid two eggs, each producing two children.
When Thyestes seized control in Mycenae, two exiled princes, Agamemnon and Menelaus came to Sparta, where they were received as guests and lived for a number of years. The princes eventually married Tyndareus' daughters, Clytemnestra and Helen respectively.
According to Stesichorus, while sacrificing to the gods Tyndareus forgot to honor Aphrodite and thus the goddess was angered and made his daughters twice and thrice wed and deserters of their husbands.  As what Hesiod also says:
Helen was the most beautiful woman in the world, and when it was time for her to marry, many Greek kings and princes came to seek her hand or sent emissaries to do so on their behalf. Among the contenders were Odysseus, Ajax the Great, Diomedes, Idomeneus, and both Menelaus and Agamemnon. All but Odysseus brought many and rich gifts with them. Helen's favourite was Menelaus who, according to some sources, did not come in person but was represented by his brother Agamemnon, who chose to support his brother's case, and himself married Helen's half-sister Clytemnestra instead. 
Tyndareus would accept none of the gifts, nor would he send any of the suitors away for fear of offending them and giving grounds for a quarrel. Odysseus promised to solve the problem in a satisfactory manner if Tyndareus would support him in his courting of Penelope, the daughter of Icarius.  Tyndareus readily agreed and Odysseus proposed that, before the decision was made, all the suitors should swear a most solemn oath to defend the chosen husband against whoever should quarrel with the chosen one. This stratagem succeeded and Helen and Menelaus were married. Eventually, Tyndareus resigned in favour of his son-in-law and Menelaus became king.
Some years later, Paris, a Trojan prince came to Sparta to marry Helen, whom he had been promised by Aphrodite. Helen left with him – either willingly because she had fallen in love with him, or because he kidnapped her, depending on the source – leaving behind Menelaus and Hermione, their nine-year-old daughter. Menelaus attempted to retrieve Helen by calling on all her former suitors to fulfil their oaths, leading to the Trojan War. 
According to Euripides's Orestes , Tyndareus was still alive at the time of Menelaus’ return,  and was trying to secure the death penalty for his grandson Orestes due to the latter's murder of his own mother who was also Tyndareus’ daughter, Clytemnestra, but according to other accounts he had died prior to the Trojan War.  In some versions of the myth, Tyndareus was one of the dead men resurrected by Asclepius to live again.  
In Greek mythology, Agamemnon was a king of Mycenae who commanded the Greeks during the Trojan War. He was the son, or grandson, of King Atreus and Queen Aerope, the brother of Menelaus, the husband of Clytemnestra and the father of Iphigenia, Electra, Laodike (Λαοδίκη), Orestes and Chrysothemis. Legends make him the king of Mycenae or Argos, thought to be different names for the same area. Agamemnon was killed upon his return from Troy, either by his wife's lover Aegisthus or by his wife herself.
In Greek mythology, the Trojan War was waged against the city of Troy by the Achaeans (Greeks) after Paris of Troy took Helen from her husband Menelaus, king of Sparta. The war is one of the most important events in Greek mythology and has been narrated through many works of Greek literature, most notably Homer's Iliad. The core of the Iliad describes a period of four days and two nights in the tenth year of the decade-long siege of Troy; the Odyssey describes the journey home of Odysseus, one of the war's heroes. Other parts of the war are described in a cycle of epic poems, which have survived through fragments. Episodes from the war provided material for Greek tragedy and other works of Greek literature, and for Roman poets including Virgil and Ovid.
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