Freud goes to Paris to study with Jean-Marin Charcot, who has been experimenting with hypnosis to treat patients with "hysterical" neuroses. Returning to Vienna, his advocacy of Charcot's techniques is largely rejected, especially by his superior, Theodor Meynert. With the aid of Josef Breuer he begins to use hypnosis to treat patients, in particular the (fictional) Baroness von Lieben. His work leads him to begin investigating the role of dreams and repression of memories.
—Wikipedia