Maximillen Robespierre was the extreme radical leader who started the reign of terror. The reign of terror lasted from 5th September 1793 to 28th July 1794. This is the period that is known for its great violence. The fight was between two political groups named Jacobins and the Girondins. Numerous people were executed by both the factions. The people that stood against the revolution got executed. The number of people executed or killed numbered in thousands. It was the time of the French revolution.