The Enlightenment was an 18th century intellectual movement that emphasized reason and scrutiny of traditions. It brought humanitarian reforms and an optimistic view that reason could solve problems. Major influences included the Renaissance revival of classical learning emphasizing human rationality. Enlightenment thinkers like Locke, Hume, Voltaire and Rousseau spread new ideas through writing and visits to other nations. Enlightened monarchs like Frederick the Great and Joseph II enacted reforms but the French Revolution was a reaction against some Enlightenment ideals.