The Delphic Oracle (Pythia) was the most important oracle in all of Ancient Greece. It was positioned at the Temple of Apollo at Delphi on the slopes of Mount Parnassus, beneath the Castalian Spring (ravine) on the north shore of the Corinthian Gulf.
The Pythia was any priestess throughout history at the Temple of Apollo; the most powerful woman of the classical world. When one priestess died, another would be chosen from a prominent family. She would then have to give up all family responsibilities and surrender her identity.
Apollo would speak to the oracle, and she would pass the prediction to those who sought advice, although these predictions were often obscure or cryptic.
People came from all over Greece and further afield to pay and seek advice from the oracle as she spoke for Apollo and there were often arguments about the correct interpretation of the predictions.
If a person was willing to pay again, a further prediction would be given.
The predictions of the Pythia made Delphi a very wealthy city-state.