The Reign of Terror was created to fight the enemies of the Revolution. It's to prevent the counter-revolution and anyone who were accused to resist the Revolution were executed and put at the guillotine, it symbolizes the Reign of Terror. They believed that guillotine was less painful than the other execution method.
Many people lost their lives, even the king and queen of France were put in the guillotine which create wave of fear not only to the people of France, but also to the other country. Maximilian Robespierre was the head of the Committee of Safety during the peak of Reign of Terror. He was also executed and put into the guillotine. Reign of Terror was suppose to strengthen the Revolution, but instead it weakened it.
Napoleon Bonaparte was a French military leader that became French emperor and conquered much of Europe. He gained power in 1799 and crowned himself in as an emperor of France in 1804.
Napoleon was a hero. He established orders and reforms the benefited the citizen of French. For example, he built a network of high schools, universities, and technical schools to educate young men and he made the Concordat agreement with the Pope. This agreement says that most of the French citizen were Roman Catholic, but it didn't require that they have to be. He also helped spread nationalism to the people that he conquered.
Other Country's View
Prince Klemens von Metternich of Austria wants to restore the balance of power and make the Europe peaceful again. Like Metternich the other diplomats also wants to make sure that the French would never become so powerful so they rewrite the map. They were worried that the people might revolt again so they wanted to erase all the traces of the Revolution and Napoleon's rule.