FROM THE HISTORICAL RECORD

The greatest blessings granted to mankind come by way of madness, which is a divine gift.

—SOCRATES, ON THE
ORACLE OF DELPHI

Ancient Greeks, with their pantheon of gods, held an abiding belief in the powers of prophecy. They revered those who could read the portents in the entrails of goats, who saw the future in the rising smoke of a sacrificial fire, who predicted events based on the auguries of tossed bones. But one individual was held in the highest esteem: the mystical Oracle of Delphi.

For almost two thousand years, a succession of closely guarded women resided within the temple to Apollo on the slopes of Mount Parnassus. Each generation, a single woman ascended to the seat of prophecy and took the name Pythia. While under a vapor-induced trance, she answered questions about the future—from the mundane to the profound.

Her admirers included leading figures of Greek and Roman history: Plato, Sophocles, Aristotle, Plutarch, Ovid. Even early Christians revered her. Michelangelo painted her prominently on the ceiling of the Sistine Chapel, foretelling the coming of Christ.

But was she a charlatan, duping the masses with cryptic answers? No matter the truth, one fact is beyond dispute. Revered by kings and conquerors across the ancient world, Pythia’s prophecies changed the course of human history.

And while much about her remains shrouded in mystery and mythology, one truth has emerged. In 2001, archaeologists and geologists discovered a strange alignment of tectonic plates under Mount Parnassus that has been shown to vent hydrocarbon gases, including ethylene, which is capable of inducing a trancelike euphoria and hallucinations, the very vapors described in the historical record.

So while science has discovered one of Pythia’s secrets, the ultimate truth remains unknown:

Did the Oracle truly foresee the future? Or was it divine madness?

Man, know thyself, and thou wilt know the universe and the gods.

—INSCRIPTION AT THE TEMPLE OF DELPHI