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The people of Paris didn't want a counter-revolution from the clergy who were imprisoned, so they killed them.
Because the clergy owned most of the land, and had a majority of the nation's wealth, they were usually driven out of the country or killed by the peasants.
soldiers
The French Revolution was unfriendly toward the Catholic Church. It was in fact punitive in almost every manner. The state confiscated lands, monasteries, convents, schools, churches and anything that could be converted to cash. It exiled thousands of clergy, it imprisoned thousands of clergy and it killed thousands of clergy. France did not reconcile with the Catholic Church until the Concordat between Napoleon and the Pope in 1801.
She was killed because of it.
The decline of feudalism made the nobility less important. This was partly because of the rise of the middle class, which included commoners who were as wealthy as or wealthier than many members of the nobility. And it was partly because they had lost their military importance as knights became vulnerable and standing armies reduced their value as a first response. Ultimately, this made life a bit easier for the nobility, as they did not have quite as much responsibility, but were able to buy luxuries supplied by the middle class merchants.
Approximately 40.000.
Charlotte Corday
4,000 royals were killed
Of course the power of the monarchs (well, it didn't decrease, they were actually killed) and the power and privileges of the nobility. The Catholic Church lost all of their property and their vast land holdings and a great many of them also lost their lives.
The stated reason was to preserve and protect the French Revolution from being overthrown by Royalists and moderates.
Jean Paul Marat