Gaea

In the episode, Oh My Goddess! Part 1, The Charmed Ones are turned into Greek Goddesses to stop The Titans.

Paige is turned into Athena, Phoebe is turned into Aphrodite and Piper is turned into Gaia.

The Charmed Ones managed to stop the Titans when Piper learned to control Gaia's powers but afterwards her powers took control of Piper. Gaia's powers were later removed from Piper when Leo pursuaded her to calm down.