Theseus and Helen.
At the age of fifty, Theseus made a pact with his best friend Pirithous, king of the Lapiths, in which they vowed to help each other marry women suited to their positions—Theseus’s as a son of Poseidon, Pirithous’s as a son of Zeus. Theseus selected Helen, daughter of Leda and Zeus, although she was only twelve years old. The two men kidnapped her and brought her to Aphidnae in Attica, where she was placed in the care of Theseus’s mother, Aethra, until she should be mature enough to marry. Then, Theseus went with Pirithous into the Underworld in an abortive attempt to abduct Persephone, wife of Hades, and was trapped there until Heracles released him. In Theseus’s absence Helen’s brothers. Castor and Polydeuces (Pollux), invaded Attica and retrieved their sister. They also kidnapped Aethra and carried her off with them.
       According to Pausanias, after Theseus raped Helen she gave birth to Iphigenia, then gave the infant to her sister, Clytemnestra, to rear as her own.
      
       Classical Sources. Diodorus Siculus, Biblioteca 4.63. Ovid, Metamorphoses 15.232-4- Apollodorus, Biblioteca 3-10.7, Ei.2.1— 24. Plutarch, Parallel Lives, ‘Theseus” 3off. Pausanias, Description of Greece 2.22.6—7, 10.29.9. Hyginus, Fabulae 79. Colluthus, The Rape of Helen.