Oracle

The Greek oracle was consulted by individuals and by states on questions of war, colonisation and cult, and what made it function politically was the very ambiguity for which it is now mocked.

The Pythia

At Delphi the office was held by the Pythia, a woman of Delphi who responded to enquiries on fixed days in the temple of Apollo. She was not understood to be interpreting; the tradition held that Apollo spoke through her. Priests were present, and the relationship between what she said and what the enquirer received in writing has been argued over since antiquity, the ancient sources themselves disagreeing about how much shaping went on. She served for life once appointed and was required to remain celibate during her tenure.

Ambiguity as a feature

The answers determined colonisation, war and cult foundation across the Greek world, and the classic case is the reply to Croesus, that if he crossed the Halys he would destroy a great empire, which was true whichever empire fell. The ambiguity was not a defect but the mechanism: an oracle that committed to a plain prediction could be shown wrong, while one that spoke in riddles retained authority whatever happened. Geological work since the late 1990s identified faults beneath the temple emitting hydrocarbons, offering a possible mechanism for the ancient reports of vapours, though the finding is contested and does not settle what the participants understood themselves to be doing.

Delphi was the most famous Greek oracle but not the only one: Dodona, sacred to Zeus, was reputed even older and delivered its answers through the rustling of a sacred oak tree interpreted by priests, while other oracular shrines, including that of Apollo at Didyma in Asia Minor, operated on their own procedures and drew their own regional clientele, so the Pythia at Delphi represents the best documented example of a much wider Greek institution of consulting a god through a fixed local method rather than a unique phenomenon.

The oracle at Delphi declined gradually alongside the wider decline of institutional pagan religion in the Roman world, and later Christian writers reported, with evident satisfaction, that the oracle had fallen silent, a tradition the historian Plutarch had already discussed centuries earlier under the heading of why oracles generally seemed weaker in his own day than in the past. The Roman emperor Theodosius I's edicts against pagan worship in the 390s CE are generally treated as marking the effective end of organised oracular consultation at the site, after which Delphi survived only as a physical ruin and, in the modern period, became one of the most visited archaeological sites in Greece, its ancient religious function entirely ended.