A cunning criminal in "The Purloined Letter" who is both a poet and a mathematician and appears. This dual sensibility allows him to completely baffle the Prefect and the police. He meets his match in Auguste Dupin, whom he once wronged and solves the case as a kind of revenge. The Minister D____ and Dupin are actually very similar, and suggest a split personality, doppelganger theme, if a bit more subtly than some of Poe’s other tales.
The timeline below shows where the character The Minister D____ appears in Poe's Stories. The colored dots and icons indicate which themes are associated with that appearance.
The Purloined Letter
...on the police’s habitual thorough investigations. The prefect says it was necessary to search the Minister’s apartment, and this could be quite conveniently done because of the Minister’s frequent absence at... (full context)
...a kind of average, Prefect-like intelligence and not of the more unusual kind of the Minister. Their problem is they never adjust their approach, they only exaggerate it, as they did... (full context)