At the end of the Napoleonic Wars and the defeat of the French Republic, we installed those nobles who still lived back in command of France.  Unfortunately, they were as unpopular as they had been before the French Revolution, and the French continued to disagree with their ruling methods.  Rebellions became so numerous that they named them after the month they occurred in, until they depleted the months of the year.  After that, they had to be more original.