14. Louis Antoine de Saint-Just
If Antoine Quentin Fouquier-Tinville was one of the most sinister figures of the revolution, Louis Antoine de Saint-Just was the public face of the Reign of Terror. He rose through the ranks of the National Convention and became personal friends with Robespierre. He wrote the draft of the French Constitution of 1793, the second constitution of the revolution (the first having been written in 1791) that did away with the moderate reforms that had previously been promised.
When the revolution began, de Saint-Just wrote prolifically on social and political theories, with a moralizing tone, in pamphlets and other mediums. He was also impassioned rhetoric, who often moved audiences to tears regarding the principles of the revolution and his dedication to it.
By the time he drafted the 1793 constitution, martial law had effectively been established throughout France. This rule probably suited de Saint-Just just fine, as he was a military leader who was noted for his strict discipline and ruthless zeal for the revolution. When he returned from the war with Austria in 1794, he found that Robespierre had lost much of his power. Still, he continued to give impassioned speeches to the National Convention, even when the threat of physical violence was imminent. He was arrested soon after his return and executed with Robespierre.