Monsieur de Paris
The public executioner or Jack Ketch of France.
“Riccardo de Albertes was a personal friend of all the `Messieurs de Paris,' who served the Republic. He attended all capital executions, and possesses a curious library.” —Newspaper Paragraph, January 25th, 1893.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894