Around five hundred and fifty years before Christ, a king designed what may be the first blind test of psychic power in recorded history. Seven oracles. One sealed question. One impossible answer. One oracle passed the test. And what happened next destroyed the king anyway.

The king was Croesus of Lydia, so rich that his name is still a proverb for wealth. Next door, Persia was rising under Cyrus, and Croesus faced the question every king faced: to strike first, or wait. He intended to ask the gods. But Croesus did something no ruler had thought to do before. Before trusting the prophets, he tested them. Messengers rode out from Sardis to the seven great oracles of the world, Delphi among them, carrying sealed instructions: on the hundredth day after departure, ask the oracle one question. What is the king of Lydia doing right now? And on that hundredth day, alone, Croesus performed the strangest act he could invent: he cut up a tortoise and a lamb, and boiled them together in a bronze cauldron, under a bronze lid.

At Delphi, as Herodotus tells it, the priestess answered before the question had even been finished. I know the number of the sands, she said, and the measures of the sea. And there comes to my senses the smell of a hard shelled tortoise, boiling in bronze with the flesh of a lamb: bronze beneath it, bronze above. The messengers wrote it down and rode for home. Of the seven oracles, Delphi alone had passed. Croesus buried the shrine in gold, gold bricks, golden bowls, a lion of solid gold, and then, at last, asked his real question. Should he march against Persia? The answer came back, and it is the most famous sentence in the history of prophecy: if Croesus crosses the river Halys, he will destroy a great empire.

He crossed. And the great empire he destroyed was his own. Sardis fell, Cyrus took Lydia, and the richest king in the world ended as a prisoner. Herodotus says Croesus sent his chains to Delphi and asked the god: why did you lie to me? And the answer came back, gentle and terrible: the god spoke truly. A great empire has fallen. A wise man would have asked which one. The first blind test in history proved that the oracle could see. It never promised that the king could read.

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