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On the sign:
ICI S’ÉLEVAIT LA PRISON DE L’ABBAYE OU LES MASSACRES DE SEPTEMBRE 1792 FIRENT 326 VICTIMES
In September 1792, in the midst of the French Revolution, after the emergency regulations established, and the fear of traitors, thousands were thrown into prison based on flimsy suspicions. The crowd, with the help of the forces of the revolution, lynched hundreds of prisoners who were in the prison located in this place.