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1815 ( MDCCCXV) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1815th year of the Common Era (CE) and (AD) designations, the 815th year of the Anno Domini 2nd millennium, the 15th year of the 19th century, and the 6th year of the 1810s decade. As of the start of 1815, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
January 2 – Lord Byron marries Anna Isabella Milbanke in Seaham, County Durham, England.
January 3 – Austria, Britain, and Bourbon-restored France form a secret defensive alliance treaty against Prussia and Russia.
January 8 – War of 1812 – Battle of New Orleans: American forces under General Andrew Jackson defeat an invading British force in the last major battle of the war (ironically, the Battle of New Orleans was fought after the Commissioners had signed the Treaty of Ghent, on 24 December 1814, which would be ratified in February 1815; thus, this battle had no impact on the outcome of the war).
January 13 - War of 1812: British troops capture Fort Peter in St. Marys, Georgia, the only battle of the war to take place in the state.
January 15 – War of 1812 – Capture of USS : American President frigate USS , commanded by Commodore President Stephen Decatur, is forced to surrender to a squadron of four British frigates.
February – The Hartford Convention arrives in Washington, D.C.
February 3 – The first commercial cheese factory is founded in Switzerland.
February 4 – The first Dutch student association, the , is founded in the Netherlands. The first rector of the senate is B. J. Winter. Groninger Studentencorps Vindicat atque Polit
February 6 – New Jersey grants the first American railroad charter to John Stevens.
February 17 – The Spanish reconquest of Latin America begins.
February 18 – The War of 1812 between the United States the United Kingdom (including Canada) officially ends, following ratification of the Treaty of Ghent ( 1814) in Washington, D.C..
February 26 – Napoleonic Wars: Napoleon Bonaparte escapes from Elba.
March 15 – Joachim Murat, King of Naples, declares war on Austria in an attempt to save his throne, starting the Neapolitan War.
March 16 – William I becomes King of the Netherlands.
March 2– 18 – Sri Vikrama Rajasinha of Kandy, the last king in Ceylon, is deposed under the terms of the Kandyan Convention, which results in Ceylon becoming a British colony. March 20 – Napoleonic Wars: Napoleon enters Paris, after escaping from Elba with a regular army of 140,000 and a volunteer force of around 200,000, beginning his rule. Hundred Days
April 5– 12 – Mount Tambora in the Dutch East Indies blows its top explosively during an eruption, killing upwards of 92,000, and propelling thousands of tons of aerosols ( Sulfide gas compounds) into the upper atmosphere ( stratosphere). The high level gases reflect sunlight, and cause the widespread cooling (known as a volcanic winter) and heavy rains of 1816, causes snows in June and July in the northern hemisphere, widespread crop failures, and subsequently famine, which is why 1816 is later known as the . Year Without a Summer
April 21 – The eastern part of the former Garhwal Kingdom is joined with Kumaon division, under the administration of the British Raj.
April 24 – The Second Serbian Uprising against Ottoman rule takes place in Takovo, Ottoman Serbia. By the end of the year Serbia is acknowledged as a semi-independent state; the ideals of the First Serbian Uprising have thus been temporarily achieved.
May 3 – Battle of Tolentino: Austria defeats the Kingdom of Naples, which quickly ends the Neapolitan War. Joachim Murat, the defeated King of Naples, is forced to flee to Corsica, and is later executed.
May 30 – The , an Arniston East Indiaman ship repatriating wounded troops to England from Ceylon, is wrecked near Waenhuiskrans, South Africa, with the loss of 372 of the 378 people on board.
June 9 – The Final Act of the Congress of Vienna is signed: A new European political situation is set. The German Confederation and Congress Poland are created, and the neutrality of Switzerland is guaranteed. Also, Luxembourg declares independence from the French Empire.
June 15 – The Duchess of Richmond's ball is held in Brussels, "the most famous ball in history".  
June 18 – Napoleonic Wars – Battle of Waterloo: Arthur Wellesley, 1st Duke of Wellington and Gebhard Leberecht von Blücher decisively defeat Napoleon. June 22 – Napoleonic Wars: Napoleon abdicates again; Napoleon II (1811-1832), age 4, rules for two weeks (22 June to 7 July).
July 8 – Napoleonic Wars: Louis XVIII returns to Paris, and is 'restored' as King of France (he had declared himself king on 8 June 1795, at the death of his nephew, 10-year-old Louis XVII, and had lived in Westphalia, Verona, Russia, and England).
July 15 – Napoleonic Wars: Napoleon boards HMS off Bellerophon Rochefort, and surrenders to Captain Frederick Lewis Maitland of the Royal Navy.
August 2 – Napoleonic Wars: Representatives of the United Kingdom, Austria, Russia and Prussia sign a convention at Paris, declaring that Napoleon Bonaparte is "their prisoner" and that "His safe keeping is entrusted to the British Government." 
August 7 – Napoleonic Wars: Napoleon is transferred to HMS , to begin his forced and final second exile, on the remote island of Northumberland Saint Helena in the South Atlantic Ocean. 
September 23 – The Great September Gale of 1815 is the first hurricane to strike New England in 180 years. September 26 – Austria, Prussia and Russia sign a Holy Alliance, to uphold the European status quo. 
October – Robert Adams, American sailor and the first Westerner to visit Timbuktu, is found wandering the streets of London, starving and half-naked, leading to the invitation for him to tell his story as a Barbary captive, which is later published as . The Narrative of Robert Adams 
October 3 – The Chassigny Martian meteorite falls in Chassigny, Haute-Marne, France.
October 15 – Napoleonic Wars: Napoleon begins his exile on Saint Helena in the Atlantic Ocean.
November 3 – Sir Humphry Davy announces his invention, the Davy lamp (a coal mining safety lamp),  
November 5 – The Ionian Islands become a British protectorate, the  United States of the Ionian Islands.
November 20 – The Napoleonic Wars come to an end after 12 years, with the British government restoring the status quo of France, prior to when the French Revolution began in 1789.
November 27 – The Constitution of the Kingdom of Poland is signed, creating Congress Poland, a constitutional monarchy in personal union with the Russian Empire, under terms agreed at the Congress of Vienna.
December 7 – Marshal Ney is executed in Paris, near the Jardin du Luxembourg.
December 23 – The novel by Emma Jane Austen is first published. December 25 – The Handel and Haydn Society, the oldest continuously performing arts organization in the United States, gives its first performance, in Boston. 
January 11 – John A. Macdonald, 1st Prime Minister of Canada, Father of Confederation (d. 1891)
January 15 – Bertha Wehnert-Beckmann, German photographer (d. 1901)
January 16 – Henry Halleck, American general (d. 1872)
January 21 – Horace Wells, American dentist, anesthesia pioneer (d. 1848)
February 10 – Constantin Bosianu, 4th Prime Minister of Romania (d. 1882)
February 15 – Constantin von Tischendorf, German Biblical scholar (d. 1874)
March 9 – David Davis, American politician, Associate Justice of the Supreme Court of the United States (d. 1886)
March 11 – Anna Bochkoltz, German operatic soprano, voice teacher and composer (d. 1879)
April 6 – Robert Volkmann, German composer (d. 1883)
April 24 – Anthony Trollope, English author (d. 1882)
May 11 – Richard Ansdell, English painter, engraver (d. 1885)
May 27 – Sir Henry Parkes, father of the Australian Federation (d. 1896) June 18 – Ludwig Freiherr von und zu der Tann-Rathsamhausen, Bavarian general (d. 1881)
July 26 – Robert Remak, German embryologist, physiologist and neurologist (d. 1865)
August 5 – Edward John Eyre, English explorer, colonial governor (d. 1901)
August 16 – Saint John Bosco, Italian priest, educator (d. 1888)
October 16 – Francis Lubbock, Governor of Texas (d. 1905)
October 23 – João Maurício Vanderlei, Baron of Cotejipe, Brazilian magistrate, politician (d. 1889)
October 31 – Karl Weierstrass, German mathematician (d. 1897)
November 2 – George Boole, English mathematician, philosopher (d. 1864)
November 5 – Luís Carlos Martins Pena, Brazilian playwright (d. 1848)
November 12 – Elizabeth Cady Stanton, American women's rights activist (d. 1902)
November 20 – Maria Cederschiöld, Swedish deaconess (d. 1892)
December 2 – Juan Javier Espinosa, 9th President of Ecuador (d. 1870)
December 8 – Adolph Menzel, German artist, painter (d. 1905)
December 10 – Augusta Ada King (née Byron), Countess of Lovelace, English computer pioneer, daughter of Lord Byron (d. 1852)
December 13 – Pálné Veres, Hungarian educator, women's rights activist (d. 1895)
December 21 – Thomas Couture, French painter (d. 1879)
December 30 – Joseph Toynbee, English otologist (d. 1866) December 31 – George Meade, American general (d. 1872)
January 8 – Edward Pakenham, British general (killed in battle) (b. 1778)
January 16 – Emma, Lady Hamilton, politically active British courtesan, lover of Horatio Nelson (b. 1765)
January 24 – Sir Charles Malet, 1st Baronet, British East India Company official (b. 1752)
February 9 – Ellen Hutchins, Irish botanist (b. 1785)
February 24 – Robert Fulton, American inventor (b. 1765)
February 26 – Prince Josias of Saxe-Coburg-Saalfeld, Austrian general (b. 1737)
March 4 – Frances Abington, English actress (b. 1737)
March 5 – Franz Mesmer, German developer of animal magnetism (b. 1734)
April 3 – José de Córdoba y Ramos, Spanish explorer and naval commander (b. 1732)
April 21 – Joseph Winston, American patriot, Congressman from North Carolina (b. 1746)
May 11 – Aletta Haniel, German business person (b. 1742)
May 25 – Domenico Puccini, Italian composer (b. 1772)
June 1 – Louis-Alexandre Berthier, French marshal (b. 1753)
June 16 – Friedrich Wilhelm, Duke of Brunswick-Wolfenbüttel, German noble, general (killed in battle) (b. 1771)
June 17 Louis-Michel Letort de Lorville, French general (b. 1773)
June 18 (killed at the Battle of Waterloo):
June 26 – William Howe De Lancey, British quartermaster-general (mortally wounded at Waterloo) (b. 1778) June 27 – Jean-Baptiste Girard, French general (mortally wounded at Ligny) (b. 1775)
July 3 – Friedrich Wilhelm von Reden, German pioneer in mining and metallurgy (b. 1752)
August 2 – Guillaume Marie-Anne Brune, French marshal (murdered) (b. 1763)
August 6 – James A. Bayard, U.S. Senator from Delaware (b. 1767)
September 9 – John Singleton Copley, American painter (b. 1738)
September 13 – Mihály Gáber, Slovene writer in Hungary (b. 1753)
September 20 – Nicolas Desmarest, French geologist (b. 1725)
October 13 – Joachim Murat, French marshal, King of Naples (executed) (b. 1767)
October 19 – Paolo Mascagni, Italian anatomist (b. 1755)
October 22 – Claude Lecourbe, French general (b. 1759)
December 3 – John Carroll, first American Roman Catholic Archbishop (b. 1735)
December 7 – Michel Ney, French marshal (executed) (b. 1769)
December 8 – Mary Bosanquet Fletcher, Methodist preacher and philanthropist (b. 1739)
December 22 – José María Morelos, leader of Mexican War of Independence, executed (b. 1765)  December 29 – Saartjie Baartman, South African sideshow performer
Longford, Elizabeth. "194". In Hastings, Max (ed.). . pp. 230-234. The Oxford Book of Military Anecdotes
Sutherland, John; Fender, Stephen (2011). "15 June". Love, Sex, Death & Words: surprising tales from a year in literature. London: Icon. pp. 228-9. ISBN . 978-184831-247-0
^ Charles Jean Tristan, Count Montholon,
History of the Captivity of Napoleon at St. Helen (E. Ferrett & Company, 1846) p83
^ Andrew Roberts,
Napoleon and Wellington: The Battle of Waterloo- and the Great Commanders who Fought it (Simon and Schuster, 2001) p199
^ Tim Chapman,
The Congress of Vienna 1814-1815 (Routledge, 2006) p60
Adams, Charles Hansford (2005). The Narrative of Robert Adams: A Barbary Captive. New York: Cambridge University Press. p. x.
^ To a meeting of the
Royal Society in Newcastle upon Tyne.
"Icons, a portrait of England 1800-1820". icons.org.uk. Archived from the original on October 16, 2009 . Retrieved 2007.
Palmer, Alan; Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 247-248. ISBN . 0-7126-5616-2
Johnson, H. Earle (1986). "Handel and Haydn Society". In Hitchcock, H. Wiley; Sadie, Stanley (eds.). . The New Grove Dictionary of American Music II. London: Macmillan Press. p. 318. ISBN . 0-943818-36-2
"Biografía de José María Morelos" (in Spanish). Historia del Nuevo Mundo . Retrieved 2019.