His appearance in the middle of the 18th century in the secular salons of Vienna, Paris and St. Petersburg gave rise to the myth of the Count of Saint-Germain. Incredible rumors circulated about him everywhere: he was more than three thousand years old, he knew Jesus Christ himself, he could make diamonds and become invisible. Adherents of Saint Germain believe that he was a man endowed with supernatural abilities, the owner of the highest secrets and the elixir of immortality. Numerous detractors present him as a successful scoundrel, a third-rate alchemist, an impostor and a charlatan. Who was this man accepted by the sovereigns of France, Germany and Russia?