The Age of Enlightenment (or simply the Enlightenment or Age of Reason) was a cultural movement of intellectuals in 18th century Europe and America, whose purpose was to reform society and advance knowledge. It promoted science and intellectual interchange and opposed superstition, intolerance and abuses in church and state. Originating about 1650 to 1700, it was sparked by philosophers Baruch Spinoza (1632–1677), John Locke (1632–1704), Pierre Bayle (1647–1706), physicist Isaac Newton (1643–1727), and philosopher Voltaire (1694–1778). The wide distribution of the printing press, invented in Europe in 1440, made possible the rapid dispersion of knowledge and ideas which precipitated the Enlightenment. Ruling princes often endorsed and fostered figures and even attempted to apply their ideas of government in what was known as Enlightened Despotism. The Enlightenment flourished until about 1790–1800, after which the emphasis on reason gave way to Romanticism's emphasis on emotion and a Counter-Enlightenment gained force.^{[citation needed]}

John Locke FRS ( /ˈlɒk/; 29 August 1632 – 28 October 1704), widely known as the Father of Classical Liberalism, was an English philosopher and physician regarded as one of the most influential of Enlightenment thinkers. Considered one of the first of the British empiricists, following the tradition of Francis Bacon, he is equally important to social contract theory. His work had a great impact upon the development of epistemology and political philosophy. His writings influenced Voltaire and Rousseau, many Scottish Enlightenment thinkers, as well as the American revolutionaries. His contributions to classical republicanism and liberal theory are reflected in the United States Declaration of Independence.

Locke's theory of mind is often cited as the origin of modern conceptions of identity and the self, figuring prominently in the work of later philosophers such as Hume, Rousseau and Kant. Locke was the first to define the self through a continuity of consciousness. He postulated that the mind was a blank slate or tabula rasa. Contrary to pre-existing Cartesian philosophy, he maintained that we are born without innate ideas, and that knowledge is instead determined only by experience derived from sense perception.

Catherine II, also known as Catherine the Great (Russian: Екатерина II Великая, Yekaterina II Velikaya; German: Katharina die Große), Empress of Russia (2 May [O.S. 21 April] 1729 – 17 November [O.S. 6 November] 1796), was the most renowned and the longest-ruling female leader of Russia, reigning from 9 July [O.S. 28 June] 1762 until her death at the age of 67. She was born in Stettin, Pomerania, Prussia as Sophie Friederike Auguste von Anhalt-Zerbst-Dornburg, and came to power following a coup d'état and the assassination of her husband, Peter III, at the end of the Seven Years' War. Russia was revitalised under her reign, growing larger and stronger than ever and becoming recognised as one of the great powers of Europe.

In both her accession to power and in rule of her empire, Catherine often relied on her noble favourites, most notably Grigory Orlov and Grigory Potemkin. Assisted by highly successful generals such as Pyotr Rumyantsev and Alexander Suvorov, and admirals such as Fyodor Ushakov, she governed at a time when the Russian Empire was expanding rapidly by conquest and diplomacy. In the south, the Crimean Khanate was crushed following victories over the Ottoman Empire in the Russo-Turkish wars, and Russia colonised the vast territories of Novorossiya along the coasts of the Black and Azov Seas. In the west, the Polish-Lithuanian Commonwealth, ruled by Catherine's former lover, king Stanisław August Poniatowski, was eventually partitioned, with the Russian Empire gaining the largest share. In the east, Russia started to colonise Alaska, establishing Russian America.