Athenian law treated revealing the content of the Eleusinian Mysteries to the uninitiated as a capital offense, and the hierophant, as the office with the fullest access to that content, carried the heaviest weight of that prohibition. The threat was not merely formal: ancient sources record real prosecutions for impiety tied to alleged disclosure or mockery of the Mysteries, the philosopher Diagoras of Melos and, in one famous political scandal, Alcibiades among the figures accused, and the case of Alcibiades in particular shows the charge could carry serious political consequences even for a prominent public figure. That the secret held as thoroughly as it did, across many centuries of practice and thousands of participants each generation, is itself among the more striking facts of the ancient religious record: modern scholarship still cannot say with full confidence exactly what the climactic revelation was, whether it involved a physical object, a re-enacted myth, a controlled psychoactive experience, or some combination the surviving sources simply never describe plainly enough to settle.
That genuine, lasting uncertainty is treated in this atlas as an honest fact about the office rather than smoothed over: the hierophant's authority depended on knowledge that was, by design, never fully written down by those who held it, and the secrecy that protected the rite in antiquity has also successfully protected it from certain historical reconstruction today. What can be said with confidence is the structural fact of the office itself, hereditary, lifelong, and singular in its combination of religious and legal authority; what cannot be said with equal confidence is the exact content of what a hierophant showed.