The Pythia (Greek: Πυθία, Pūthia) was the priestess presiding over the Oracle of Apollo at Delphi, located on the slopes of Mount Parnassus. The Pythia was widely credited with giving prophecies inspired by Apollo, giving her a prominence unusual for a woman in male-dominated ancient Greece. The Delphic oracle was established in the 8th century BC. Its last recorded response was given in 393 AD, when the emperor Theodosius I ordered pagan temples to cease operation. During this period the Delphic Oracle was the most prestigious and authoritative oracle in the Greek world.
The oracle is one of the best-documented religious institutions of the classical Greek world. Writers who mention the oracle include Herodotus, Thucydides, Euripides, Sophocles, Plato, Aristotle, Pindar, Aeschylus, Xenophon, Diodorus, Strabo, Pausanias, Plutarch, Livy, Justin, Ovid, Lucan and Julian.
The name Pythia derived from Pytho, which in myth was the original name of Delphi. The Greeks derived this place-name from the verb pythein (πύθειν, "to rot"), used of the decomposition of the body of the monstrous serpent Python after she was slain by Apollo.
It is often said that the Pythia delivered oracles in a frenzied state induced by vapors rising from a chasm in the rock, and that she spoke gibberish which priests reshaped into the enigmatic prophecies preserved in Greek literature