Pythia, the oracle of Delphi, is Apollo's priestess.

The Pythia.

She was a priestess of Apollo.

A number of women served as the Pythia in the almost four centuries between the 8th Century BC and 393 AD when the last prediction was recorded.

In Greek mythology, Apollo's priestess is known as the Pythia or Oracle of Delphi. The Pythia was a high priestess who delivered prophecies and advice in the temple of Apollo at Delphi. She would enter a trance-like state to communicate the messages from the god Apollo to those seeking guidance.