1687 Newton publishes Principia Isaac Newton publishes Principia Mathematica, a landmark work that helps define the scientific worldview that shaped Enlightenment thought. 1689 Locke publishes Two Treatises John Locke publishes Two Treatises of Government, advancing arguments for natural rights and government by consent. 1689 Locke issues Letter Concerning Toleration Locke's Letter Concerning Toleration argues for broader religious toleration and limits on state coercion in matters of faith. 1690 Essay Concerning Human Understanding appears Locke's Essay Concerning Human Understanding develops an empiricist account of knowledge that becomes central to Enlightenment philosophy. 1697 Bayle publishes Historical and Critical Dictionary Pierre Bayle's dictionary spreads skeptical inquiry and critical examination of religious and historical claims. 1715 Death of Louis XIV marks a political turning point The death of Louis XIV weakens the model of absolute monarchy in France and opens wider space for new political and intellectual debate. 1721 Montesquieu publishes Persian Letters Montesquieu uses satire in Persian Letters to criticize European institutions, religion, and absolutism. 1734 Voltaire publishes Letters on the English Voltaire praises English constitutionalism and religious tolerance, helping popularize comparative political criticism in France. 1740 Frederick II begins rule in Prussia Frederick II becomes king of Prussia and later embodies the idea of enlightened absolutism in European politics. 1748 Spirit of the Laws is published Montesquieu's The Spirit of the Laws sets out the theory of separation of powers and deeply influences constitutional thought. 1751 First volume of the Encyclopedie appears The Encyclopedie, edited by Denis Diderot and Jean le Rond d'Alembert, begins publication as a major vehicle for Enligh… 1755 Lisbon earthquake shocks Europe The Lisbon earthquake prompts wide debate about providence, evil, and the scientific study of natural disasters. 1759 Voltaire publishes Candide Candide becomes one of the Enlightenment's most influential critiques of optimism, intolerance, and dogma. 1762 Rousseau publishes The Social Contract Jean-Jacques Rousseau argues that legitimate political authority rests on the general will of the people. 1764 Beccaria publishes On Crimes and Punishments Cesare Beccaria attacks torture and arbitrary punishment, helping launch modern reform of criminal justice. March 1776 Wealth of Nations is published Adam Smith publishes The Wealth of Nations, a foundational text of modern political economy. July 4, 1776 American Declaration of Independence adopted The Declaration of Independence applies Enlightenment ideas of rights and consent to a revolutionary political program. 1781 Kant publishes Critique of Pure Reason Immanuel Kant's Critique of Pure Reason redefines philosophy and becomes one of the great culminating works of the Enli… 1784 Kant asks What Is Enlightenment Kant's essay 'What Is Enlightenment?' famously defines enlightenment as humanity's emergence from self-incurred immatur… 1789 French Revolution begins The French Revolution transforms Enlightenment debates about sovereignty, rights, and citizenship into mass politics. 1792 Wollstonecraft publishes Vindication of the Rights of Woman Mary Wollstonecraft extends Enlightenment arguments about reason and rights to women, shaping modern feminist thought.