The French Revolution was sparked by financial crisis and influenced by Enlightenment ideas of equality and justice. It overthrew the French feudal system and Ancien Regime, abolishing the monarchy and establishing a republic. The Revolution went through three phases - first moderate reforms from 1789-1791, then a more radical period from 1792-1794 where extremists like Robespierre rose to power instituting the Reign of Terror, and finally a conservative backlash from 1794-1799 when Napoleon came to power.