Napoleon was born on August 15, 1769, at Casa Buonaparte in Ajaccio, the capital of Corsica, just one year after the Republic of Genoa ceded the island to France. He was the second surviving child of Carlo Maria di Buonaparte, an attorney of Tuscan noble descent, and Maria Letizia Ramolino. Although Carlo had initially supported the Corsican nationalist leader Pasquale Paoli against French occupation, he reconciled with the French regime after Paoli's defeat, securing recognition of his family's noble status. This patronage enabled young Napoleon to travel to mainland France in 1779, studying first at a religious school in Autun to learn French—having grown up speaking Corsican and Italian—and then for five years at the military college of Brienne.²²²³ In 1784, he entered the elite École Militaire in Paris, graduating after one year in September 1785 with a commission as a second lieutenant in the La Fère artillery regiment.

Following the outbreak of the French Revolution in 1789, Napoleon took extended leaves in Corsica, where he aligned with the republican Jacobin faction and commanded a battalion of local volunteers. His growing pro-French republicanism brought him into sharp conflict with Paoli, who sought Corsican independence with British backing. Condemned by the nationalists, the Buonaparte family fled to the French mainland in June 1793, soon adopting the Gallicized surname Bonaparte. Later that year, Napoleon distinguished himself at the Siege of Toulon, where royalist rebels had handed the vital southern port over to an Anglo-Spanish fleet.²⁴ Appointed artillery commander, he devised and executed a plan to capture elevated ground overlooking the harbor, forcing the British fleet to evacuate in December 1793 and earning promotion to brigadier general at the age of 24.

After the fall of Maximilien Robespierre in the Thermidorian Reaction of July 1794, Napoleon was briefly imprisoned at Fort Carré due to his association with Maximilien's younger brother, Augustin Robespierre, before being released within two weeks.²⁵ After refusing an infantry command in the War in the Vendée in 1795, he was left without an active posting in Paris until a royalist insurrection erupted against the National Convention on October 5, 1795 (13 Vendémiaire in the Revolutionary calendar).²⁶ Tasked by politician Paul Barras with defending the Tuileries Palace, Napoleon deployed artillery firing canisters of grapeshot into the advancing columns, killing roughly 1,400 insurgents and securing the incoming government of the Directory. Rewarded with wealth and command of the Army of the Interior, he married Joséphine de Beauharnais, a prominent figure in Parisian society and widow of an executed general, on March 9, 1796.²⁷

Two days after his marriage, Napoleon departed Paris to assume command of the poorly supplied French Army of Italy. In a rapid campaign beginning in April 1796, he drove a wedge between the allied forces of the Kingdom of Sardinia-Piedmont and the Austrian Empire, forcing Sardinia to sign an armistice within weeks. Moving quickly across northern Italy, he defeated successive Austrian armies at the Battles of Lodi, Castiglione, Arcole, and Rivoli, and captured the fortress city of Mantua in early 1797. Advancing through the Alps toward Vienna, he compelled Austria to sign the Treaty of Campo Formio in October 1797, which ceded the Austrian Netherlands to France and recognized French-aligned sister republics across northern Italy, which Napoleon had organized independently of the Directory's instructions.

Seeking to disrupt Great Britain's overland communications and trade routes to India while removing a popular general from Paris, the Directory approved Napoleon's proposal to invade Ottoman-held Egypt in May 1798.²⁸²⁹ Sailing with some 40,000 soldiers and a commission of 167 scientists, engineers, and scholars, he captured Malta in June and landed at Alexandria on July 1.³⁰ On July 21, 1798, deploying his infantry in massive hollow divisional squares, he routed the cavalry of the ruling Mamluk caste at the Battle of the Pyramids and entered Cairo.³¹ Days later, on August 1, a British fleet under Rear-Admiral Horatio Nelson destroyed the French fleet at the Battle of the Nile in Aboukir Bay, stranding Napoleon's army in North Africa.

In early 1799, Napoleon marched into Ottoman Syria, capturing Jaffa—where he ordered the execution of thousands of Ottoman prisoners—before failing to take the coastal fortress of Acre, which was reinforced by the Royal Navy. Returning to Egypt, he defeated an Ottoman amphibious landing at Aboukir in July 1799. Although the expedition ultimately ended in French surrender to Anglo-Ottoman forces in 1801, the accompanying scholars founded the Institut d'Égypte, compiled the monumental Description de l'Égypte, and uncovered the Rosetta Stone in July 1799, laying the foundations of modern Egyptology.

Learning of French military reversals in the War of the Second Coalition and political instability in Paris, Napoleon handed command in Egypt to General Jean-Baptiste Kléber and slipped past British patrols in August 1799. Arriving in France in October, he joined a conspiracy organized by Director Emmanuel-Joseph Sieyès, Talleyrand, and his own brother Lucien Bonaparte, who served as president of the Council of Five Hundred. On November 9–10, 1799 (18–19 Brumaire, Year VIII), troops loyal to Napoleon dispersed the legislature at Saint-Cloud, abolishing the Directory and establishing the French Consulate. Outmaneuvering Sieyès, Napoleon drafted the Constitution of the Year VIII, which concentrated executive authority in his own hands as First Consul for a ten-year term, ratified by a national plebiscite.

To secure his regime, Napoleon crossed the Great St. Bernard Pass into Italy in May 1800 and defeated the Austrians at the Battle of Marengo in June.³² Following General Jean Victor Marie Moreau's victory at Hohenlinden, Austria signed the Treaty of Lunéville in February 1801, and Great Britain concluded the Treaty of Amiens in March 1802, bringing a brief interval of complete peace to Europe.³³ During this truce, Napoleon attempted to restore the pre-revolutionary plantation economy in the Caribbean. Through the Law of May 20, 1802, and subsequent consular decrees, he maintained or re-established slavery and the Atlantic slave trade in French colonies such as Martinique, Guadeloupe, and French Guiana, reversing the National Convention's abolition decree of 1794.³⁴ An expeditionary force sent under his brother-in-law General Charles Leclerc to Saint-Domingue captured the autonomous black leader Toussaint Louverture, who died in a French prison, but the French army was decimated by yellow fever and Haitian resistance, leading to Haitian independence in 1804.³⁵³⁶ Abandoning his ambitions for a North American empire, Napoleon sold the vast Louisiana territory to the United States in 1803 for 80 million francs ($15 million).

Domestically, Napoleon established enduring state institutions that he termed the "masses of granite".³⁷ He centralized local governance in 1800 by appointing prefects to administer France's departments, founded the Bank of France in January 1800 to stabilize the currency and public credit, and created the Council of State (Conseil d'État) to draft legislation. In 1802, he instituted state-funded secondary schools known as lycées to train future civil servants and military officers, and established the Legion of Honour (Légion d'honneur) to reward civil and military merit regardless of birth.³⁸

Following a series of royalist assassination plots—including the Rue Saint-Nicaise bomb plot of December 1800 and a British-backed conspiracy in 1804 that prompted Napoleon to order the abduction and execution of the Bourbon Duke of Enghien—Napoleon moved to make his rule hereditary. After become First Consul for Life in 1802, he was proclaimed Emperor of the French by the Senate on May 18, 1804, a change approved by plebiscite. At his coronation at the Cathedral of Notre-Dame in Paris on December 2, 1804, with Pope Pius VII in attendance, Napoleon placed the imperial crown upon his own head and then crowned Joséphine as empress.⁴³ In May 1805, he also crowned himself King of Italy in Milan.

Hostilities with Great Britain had resumed in May 1803, and by 1805 British Prime Minister William Pitt the Younger had assembled the Third Coalition, allying Britain with Austria, Russia, Sweden, and Naples. Although Rear-Admiral Nelson's victory over the combined Franco-Spanish fleet at the Battle of Trafalgar on October 21, 1805, ended any prospect of a French invasion of Britain from Boulogne and secured British naval supremacy, Napoleon marched his 200,000-strong Grande Armée eastward into Germany. Organized into autonomous army corps capable of marching separately and fighting together, the French encircled and captured an Austrian army of 60,000 men at Ulm in October 1805. On December 2, 1805, the first anniversary of his coronation, Napoleon lured the combined Russian and Austrian armies of Tsar Alexander I and Emperor Francis II into a trap at the Battle of Austerlitz in Moravia, shattering their center on the Pratzen Heights in what is widely regarded as his tactical masterpiece.⁴⁴ Austria signed the punitive Treaty of Pressburg, and in 1806 Napoleon organized western German states into the Confederation of the Rhine, prompting Francis II to dissolve the thousand-year-old Holy Roman Empire.

When Prussia joined Russia and Britain in the Fourth Coalition in autumn 1806, Napoleon and Marshal Louis-Nicolas Davout routed the Prussian armies on the same day, October 14, 1806, at the twin Battles of Jena and Auerstedt, entering Berlin less than two weeks later.⁴⁵⁴⁶ Advancing into East Prussia, Napoleon fought a bloody, inconclusive winter battle against the Russians at Eylau in February 1807 before crushing the Russian army at the Battle of Friedland on June 14, 1807.⁴⁷ Meeting Tsar Alexander I on a raft in the Neman River, Napoleon concluded the Treaties of Tilsit in July 1807, which stripped Prussia of half its territory, created the Polish Duchy of Warsaw and the Kingdom of Westphalia, and allied Russia with France.⁴⁸

Strained by the economic toll of the Continental System and suspicious of French designs in Poland, Tsar Alexander I withdrew Russia from the blockade of Britain at the end of 1810. On June 24, 1812, Napoleon crossed the Neman River into the Russian Empire at the head of a multinational Grande Armée of more than 450,000 to 600,000 men, less than half of whom were French.⁵² Refusing a decisive early engagement, Russian forces under Michael Andreas Barclay de Tolly and later Mikhail Kutuzov retreated deep into the interior, practicing scorched-earth tactics while heat, typhus, dysentery, and overstretched supply lines depleted the French ranks. On September 7, 1812, Kutuzov stood to fight 75 miles west of Moscow at the Battle of Borodino, the bloodiest single day of the Napoleonic Wars, resulting in some 70,000 combined casualties.⁵³⁵⁴ Napoleon entered Moscow a week later to find the city largely abandoned and soon engulfed in flames set on the orders of its Russian governor.

After waiting five weeks in the ruins of Moscow for a peace offer from Alexander I that never came, Napoleon ordered a retreat on October 19, 1812. Harassed by Russian regulars, Cossacks, starvation, and an early, severe winter, the Grande Armée disintegrated; after a desperate crossing of the Berezina River in November, fewer than 100,000 men survived to recross the border, with hundreds of thousands dead or captured. Emboldened by the catastrophe, Russia, Prussia, Britain, Sweden, and later Austria formed the Sixth Coalition in 1813.⁵⁵ Although Napoleon raised a new army of young conscripts and won tactical victories at Lützen, Bautzen, and Dresden, his forces were surrounded and decisively defeated by allied armies totaling over 300,000 men at the four-day Battle of Leipzig (the "Battle of the Nations") from October 16 to 19, 1813.

In early 1814, coalition armies invaded France from the east while Wellington advanced across the Pyrenees from Spain. Despite a rapid series of defensive maneuvers by Napoleon in the Six Days' Campaign of February 1814, Paris fell to the allies at the end of March. Pressured by his marshals, who refused to fight on at Fontainebleau, Napoleon abdicated unconditionally on April 6 (formalized on April 11), 1814. Under the Treaty of Fontainebleau, the victors restored the Bourbon monarchy under King Louis XVIII and granted Napoleon sovereignty over the small Mediterranean island of Elba, an annual pension, and a personal guard, while Marie Louise and their son returned to the Austrian court in Vienna, never to see him again.⁵⁶

Determined to prevent another escape, the British government exiled Napoleon to Saint Helena, an isolated volcanic island in the South Atlantic Ocean more than 1,200 miles from the nearest landmass. Arriving in October 1815 with a small retinue of 27 followers—including the Comte de Las Cases, General Henri-Gatien Bertrand, General Gaspard Gourgaud, and the Comte de Montholon—he was housed at Longwood House, a damp, wind-swept estate in the island's interior.⁵⁸ The island's British governor, Sir Hudson Lowe, enforced strict surveillance, curfews, and limits on Napoleon's movements and correspondence, refuses to address him by his imperial title and triggering bitter disputes between captive and jailer.

During his six years on Saint Helena, Napoleon devoted his time to dictating his memoirs and reflections on his campaigns to Las Cases and his other companions. Published in 1823 as Le Mémorial de Sainte-Hélène, the work proved a massive commercial and political success, portraying Napoleon not as a tyrant or conqueror, but as a champion of the French Revolution, enlightened liberalism, and European nationalities who had been thwarted by reactionary monarchs.

Napoleon's health declined steadily from 1817 onward, marked by lethargy, chronic abdominal pain, nausea, and vomiting.⁵⁹ By March 1821 he was confined to his bed, and he died on May 5, 1821, at the age of 51. An autopsy conducted the next day by his Corsican physician Francesco Antommarchi, witnessed by seven British doctors, attributed his death to extensive cancerous lesions and a perforated ulcer in the stomach, the same affliction that had killed his father.⁶⁰⁶¹ Although the discovery of elevated arsenic levels in samples of his hair in the mid-20th century sparked theories of deliberate poisoning by Montholon or British agents, 21st-century forensic and pathological studies—including a comprehensive 2021 review by gastrointestinal pathologists—have rejected murder theories, attributing the arsenic to 19th-century environmental exposures, cosmetics, and medicinal tonics, and confirming advanced gastric cancer with internal hemorrhage as the cause of death. Initially buried in Sane Valley on Saint Helena, his remains were returned to France in 1840 (le retour des cendres) under King Louis-Philippe and entombed beneath the dome of Les Invalides in Paris.

Few historical figures have generated as vast and polarized a historiography as Napoleon. Since the early 19th century, historians and political thinkers have divided between admirers who view him as an enlightened reformer who preserved the positive achievements of the French Revolution and modernized European governance, and critics who regard him as an authoritarian dictator and warmonger whose insatiable ambition cost millions of lives. Military historians consistently rank him among the greatest operational commanders in history; his emphasis on speed, concentration of force, the corps d'armée system, and the integration of mobile artillery with infantry and cavalry defined warfare for a century and inspired the classic military theories of Carl von Clausewitz and Antoine-Henri Jomini.

In the political and institutional sphere, Napoleon's impact outlasted his military empire. In France, the centralized administrative structure of prefects, the Council of State, the Bank of France, the lycée system, the Legion of Honour, and the Civil Code survived the Bourbon Restoration and subsequent changes of regime, forming the bedrock of the modern French state. Across continental Europe, French occupation swept away feudal obligations, ecclesiastical courts, guild restrictions, and Jewish ghettos, while introducing standardized weights and measures through the metric system and uniform legal codes. Paradoxically, both the reforms he imposed and the resentment provoked by French conscription, taxation, and requisitions catalyzed the rise of modern nationalism in Germany, Italy, Spain, and Poland, setting in motion the 19th-century movements for German and Italian unification.

At the same time, modern scholarship highlights the authoritarian and destructive dimensions of his rule. Domestically, Napoleon dismantled representative democracy, muzzled the press through strict censorship, operated a pervasive police state under Joseph Fouché, subordinated women under the Civil Code, and violently re-imposed colonial slavery in 1802. Internationally, the Napoleonic Wars (1803–1815) resulted in an estimated 3.5 million to 6 million military and civilian deaths across Europe and the Caribbean. In France, the "Napoleonic legend" he cultivated on Saint Helena enabled his nephew, Louis-Napoléon Bonaparte, to win election as president in 1848 and rule as Emperor Napoleon III during the Second French Empire from 1852 to 1870, ensuring that Bonapartism remained a potent force in French political culture well into the modern era.