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Maximilien Robespierre came to power during the radical stages of the French Revolution, and is pretty much wholly responsible for the fact that they were the most radical time periods of the Revolution. After the increasingly powerful Jacobins started to become upset with how moderate the Nation Assembly was turning out to be, they decided they had had enough (double had, LOL). The Paris Commune, a radical group composed mainly of Jacobins, rose in power and eventually overthrew the Legislative Assembly (the government that the Nation Assembly had established). The National Convention was set up (yes, they decided to use National in the name yet again), and was heavily dominated by people adhering the the opinions of the Jacobins and the Paris Commune. After executing the king and going to war with Austria, they had successfully screwed up France, and chaos ensued.
Robespierre then jumped in so he could, well...ensue more chaos. The National Assembly established the Committee of Public Safety to attempt to restore some type of order, and they placed Robespierre right on top. He pretty much just did whatever he wanted to. On his orders, huge amounts of people who were deemed not nationalistic enough were executed in the streets of Paris with the handy dandy Guillotine, a weird ass new calender was invented, the cathedral of Notre-Dame was converted to the Temple of Reason, and, to sum things up, France basically erupted into even more mayhem.
It was this blatant use of terror that achieved Robespierre extreme amounts of awesomeness. You may think it impossible, but it eventually proved to be too much awesomeness. Robespierre's peers in The National Assembly were scared that he would eventually start killing them too, so they turned against him and decided to put him on the guillotine. In a last second effort to die with dignity, Robespierre attempted to shoot himself in the face, but missed. What a loser. He ended up knocking half his face off, living through it, being guillotined, and earning a Suicide Fail.