premise: The sinister prison of the Conciergerie ' named after the royally appointed concierge in charge of common-law criminals ' welcomed Marie-Antoinette, Robespierre, Madame du Barry, Danton, and 2,500 others into its antechamber of the guillotine. 
hypothesis: This prison saw famous prisoners like Robespierre, Madame du Barry, and Marie-Antoinette.