Page "Heracles" Paragraph 3

On the night the twins Heracles and Iphicles were to be born, Hera, knowing of her husband Zeus ' adultery, persuaded Zeus to swear an oath that the child born that night to a member of the House of Perseus would become High King.

Hera did this knowing that while Heracles was to be born a descendant of Perseus, so too was Eurystheus.

Once the oath was sworn, Hera hurried to Alcmene's dwelling and slowed the birth of the twins Heracles and Iphicles by forcing Ilithyia, goddess of childbirth, to sit crosslegged with her clothing tied in knots, thereby causing the twins to be trapped in the womb.

Meanwhile, Hera caused Eurystheus to be born prematurely, making him High King in place of Heracles.

She would have permanently delayed Heracles ' birth had she not been fooled by Galanthis, Alcmene's servant, who lied to Ilithyia, saying that Alcmene had already delivered the baby.

Upon hearing this, she jumped in surprise, loosing the knots and inadvertently allowing Alcmene to give birth to Heracles and Iphicles.