C. Auguste Dupin is a fictional detective created by author Edgar Allan Poe. He first appears in the short story "The Murders in the Rue Morgue," published in 1841. Dupin is known for his analytical skills and ability to solve complex mysteries through logical reasoning and observation. Dupin is often considered a precursor to later fictional detectives, such as Sherlock Holmes. His character embodies the idea of the "ratiocinator," someone who uses intellect and deduction to unravel crimes. Dupin's adventures highlight the importance of critical thinking and the power of the human mind in solving puzzles.