Metis was seduced by Zeus and became pregnant with Athena. Before Metis gave birth, Zeus devoured her because he feared prophecies that her second child would overthrow him. It was said that Metis was the source of Zeus' wisdom, and that she advised him from inside his stomach. Athena later arose from Zeus' forehead armed and in full armor. Metis is not listed as Athena's mother because she was killed before Athena was born.
The Titans