The Murders in the Rue Morgue Poe's Dupin displays many traits which became literary conventions in subsequent fictional detectives, including Sherlock Holmes and Hercule Poirot. Many later characters, for example, follow Poe's model of the brilliant detective, his personal friend who serves as narrator, and the final revelation being presented before the reasoning that leads up to it. Dupin himself reappears in "The Mystery of Marie Rogêt" and "The Purloined Letter". The unnamed narrator of the story opens with a lengthy commentary on the nature and practice of analytical reasoning, then describes the circumstances under which he first met Dupin during an extended visit to Paris.
André Marie Jean Jacques Dupin "Principia Juris Civilis", 5 vols. (1806); "Mémoires et plaidoyers de 1800 au 1ier janvier 1830", in 20 vols.; and "Mémoires ou souvenirs du barreau", in 4 vols. (1855–1857). His brother, Pierre Charles François Dupin, was a mathematician. André Marie Jean Jacques Dupin André Marie Jean Jacques Dupin (1 February 17838 November 1865), commonly called Dupin the Elder, was a French advocate, president of the chamber of deputies and of the Legislative Assembly. Dupin was born at Varzy, in the Nièvre "département", in France. He was educated by his father, who was a lawyer of eminence, and at an early age