Marie-Jean-Léon d'Hervey de Saint Denys

Marie-Jean-Léon Lecoq, Baron d'Hervey de Juchereau, Marquis d'Hervey de Saint-Denys (6 May 1822 – 2 November 1892) was a French sinologist, known for his contributions to the study of Chinese language, literature, history, and ethnography. He is also known for his seminal research on dreams, via his 1867 book Les rêves et les moyens de les diriger; observations pratiques (Dreams and the Ways to Direct Them: Practical Observations), published anonymously. Hervey de Saint-Denys's book on dreams influenced Freud and Proust. His translations of Chinese poetry influenced Mahler.