Which event led to the decline of franz mesmers brand of hypnosis?

The decline of Franz Mesmer's brand of hypnosis, often referred to as "mesmerism," was significantly impacted by a 1784 inquiry commissioned by King Louis XVI of France. This investigation, led by a panel that included Benjamin Franklin, concluded that mesmerism lacked scientific validity and attributed its effects to imagination and suggestion rather than any mystical force. The negative findings of the commission diminished public and scientific credibility in Mesmer's practices, leading to a decline in his influence and the popularity of his methods.