The Pythia of Delphi, the most famous consulting room of the ancient world
On the slopes of Mount Parnassus stood a temple that kings, generals, and merchants climbed to before making any big decision. There a priestess, the Pythia, sat on a tripod and answered questions. Her answers were famously ambiguous: a king who asked whether he should attack the Persians was told that if he crossed the river he would destroy a great empire. He crossed, he lost, and the empire destroyed was his own.
That lasted nearly a thousand years. And it worked because people needed the same thing they need today: someone outside the problem to help them decide.