During the Old Regime of France, some words centering on the social and political contestation like "rebellion", "revolt" or even "riot" were given different meanings by different persons. Scholars have compared historical series events in the long term with severe climate fluctuations relying on complicated mathematical models. Based upon coherent climate data of the past 500 years and chronological table of contestation in France Old Regime, we conjecture that the climax of social violence occurs coincidentally with extreme climatic events.