Helen

When Zeus and Nemesis coupled in the form of swans, they had an egg that was entrusted to Leda, the wife of Spartan King Tyndareus. In some versions Leda simply waited for the egg to hatch, and in others she internalized it and delivered Helen herself.  Helen was the sister of Polydeuces and the stepsister of Caster and Clytaemnesta. She was abducted at a young age by Theseus and Peirithous.  The two gods drew names to see which would marry her.  Thesus won and he married Helen.  He had promised to find Peirithous a wife and he did. It was Persephone.