Page "Rhea (mythology)" Paragraph 10

Zeus forced Cronus to disgorge the other children in the reverse order in which they had been swallowed, the oldest becoming the last, and youngest: first the stone, which was set down at Pytho under the glens of Parnassus to be a sign to mortal men, then the rest.

In some versions, Metis gave Cronus an emetic to force him to disgorge the babies, or Zeus cut Cronus ' stomach open.

Then Zeus released the brothers of Cronus, the Gigantes, the Hecatonkheires and the Cyclops, who gave him thunder and lightning, which had previously been hidden by Gaia.

Zeus and his siblings, together with the Gigantes, Hecatonkheires, and Cyclopes, overthrew Cronus and the other Titans.

Similarly, in later myths, Zeus would swallow Metis when she was pregnant with Athena, because of a prophecy that said she would later give birth to a son who would be more glorious than his father.

Athena was born unharmed, bursting out of his head in full armor.