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1799 ( MDCCXCIX) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1799th year of the Common Era (CE) and (AD) designations, the 799th year of the Anno Domini 2nd millennium, the 99th year of the 18th century, and the 10th and last year of the 1790s decade. As of the start of 1799, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
January 9 - British Prime Minister William Pitt the Younger introduces an income tax of two shillings to the pound, to raise funds for Great Britain's war effort in the Napoleonic Wars.
January 17 - Maltese patriot Dun Mikiel Xerri, along with a number of other patriots, is executed.
January 21 - The Parthenopean Republic is established in Naples by French General Jean Étienne Championnet; King Ferdinand I of the Two Sicilies flees.
February 9 - Quasi-War: In the single-ship action of USS in the Caribbean, the American ship is the victor. Constellation vs L'Insurgente
February 28 - French Revolutionary Wars: Action of 28 February 1799 - British Royal Navy frigate HMS defeats the Sybille French frigate , off the mouth of the Forte Hooghly River in the Bay of Bengal, but both captains are killed.
March 1 - Federalist James Ross becomes President pro tempore of the United States Senate.
March 4 - The Russo-Ottoman siege of Corfu ends with the surrender of the French garrison, bringing an end to the  first period of French rule in the Ionian Islands.
March 7 - Siege of Jaffa: Napoleon captures Jaffa, Palestine, and his troops proceed to kill more than 2,000 Albanian captives.
March 29 - New York passes a law aimed at gradually abolishing slavery in the state.
April 27 - French Revolutionary Wars: The Battle of Cassano takes place outside of Milan, as Russian and Austrian troops commanded by General Alexander Suvorov rout the French Army under the command of General Jean Moreau.
May 4 - Battle of Seringapatam: Tipu Sultan is defeated and killed by the British; the captivity of Mangalorean Catholics at Seringapatam ends.
May 21 - The Siege of Acre ends after two months; Napoleon's attempt to widen his Middle Eastern campaign into Syria is frustrated by Ottoman forces, and he withdraws to Egypt.
May 27 - Battle of Winterthur: Habsburg forces secure control of north-east Switzerland, from the French Army of the Danube.
June 13 - Ferdinand I of the Two Sicilies is restored to his kingdom following the collapse of the Parthenopean Republic. June 18 - French Revolutionary Wars: Action of 18 June 1799 - A French frigate squadron, under Rear-admiral Perrée, is captured by the British fleet under Lord Keith, off Toulon.
July 7 - Ranjit Singh's men take their positions outside Lahore.
July 12 - Ranjit Singh captures Lahore from the Bhangi Misl, a key step in establishing the Sikh Empire, and becoming Maharaja of the Punjab.
July 15 - In the Egyptian port city of Rosetta, French Captain Pierre Bouchard finds the Rosetta Stone.
July 25 - At Aboukir, Egypt, Napoleon defeats 10,000 Ottoman Mamluk troops under Mustafa Pasha.
August 27 - War of the Second Coalition - Anglo-Russian invasion of Holland: Britain and Russia send an expedition to the Batavian Republic.
August 29 - Pope Pius VI, at the time the longest reigning Pontiff of the Roman Catholic Church, dies as a prisoner of war in the citadel of the French city of Valence, after 24½ years of rule.
August 30 - Anglo-Russian invasion of Holland - Vlieter Incident: A squadron of the Batavian Republic's navy, commanded by Rear-Admiral Samuel Story, surrenders to the British Royal Navy, under Sir Ralph Abercromby and Admiral Sir Charles Mitchell, near Wieringen, without joining action.
September 23 - Frederick North, 5th Earl of Guilford, the Governor of British Ceylon (now Sri Lanka, issues a proclamation declaring that the laws of the Netherlands for the conquered Dutch Ceylon shall be enforced until superseded by new laws. 
September 29 - the Second Roman Republic, a puppet state formed by the French Army after their dissolution of the Papal States and the occupation of Rome, is dissolved 19 months after its creation on February 15, 1798. 
October 6 - Anglo-Russian invasion of Holland - Battle of Castricum: Franco-Dutch forces defeat the Russo-British expedition force.
October 9 - HMS (a famous treasure wreck) is sunk in the Lutine West Frisian Islands.
October 12 - Jeanne Geneviève Labrosse becomes the first woman to jump from a balloon with a parachute, from an altitude of 900 metres (3,000 ft).
October 16 - Action of 16 October 1799: A Spanish treasure convoy worth more than £54,000,000 is captured by the British Royal Navy off Vigo.
October 18 - Anglo-Russian invasion of Holland: Anglo-Russian expedition forces surrender in North Holland.
November 9 ( Coup of 18 Brumaire) - Napoleon overthrows the French Directory in a coup d'état, which ends the French Revolution.
November 10 (19 Brumaire) - A remnant of the Council of Ancients in France abolishes the Constitution of the Year III, and ordains the French Consulate with Napoleon as First Consul, with the Constitution of the Year VIII.
November 30 - 1799-1800 Papal conclave opens in Venice at San Giorgio Monastery.
December 3 - War of the Second Coalition: Battle of Wiesloch: Austrian Lieutenant Field Marshal Anton Sztáray defeats the French at Wiesloch.
December 10 - France adopts the metre as its official unit of length.
December 14 - George Washington, first President of the United States, dies at Mount Vernon, Virginia. December 31 - The Dutch East India Company's charter is allowed to expire by the Batavian Republic.
Date unknown The Place Royale in Paris is renamed
, when the Department of Vosges becomes the first to pay new Revolutionary taxes. Place des Vosges
Eli Whitney, holding a 1798 United States government contract for the manufacture of muskets, is introduced by Oliver Wolcott, Jr. to the concept of interchangeable parts, an origin of the American system of manufacturing.  Conrad John Reed, 12, finds what he describes as a "heavy yellow rock" along Little Meadow Creek in
Cabarrus County, North Carolina, and makes it a doorstop in his home. Conrad's father John Reed learns that the rock is actually gold in 1802, initiating the first gold rush in the United States. The assassination of the 14th
Tu'i Kanokupolu, Tuku?aho, plunges Tonga into half a century of civil war. The
Nawab (provincial governor) of Oudh in northern India sends to George III of England the , an official history of the reign of Padshah Nama Shah Jahan.
William Cockerill begins building cotton-spinning equipment in Belgium. The small town of Tignish, Prince Edward Island, Canada is founded.
January 6 - Jedediah Smith, American fur trapper, explorer (d. 1831)
January 12 - Priscilla Susan Bury, British botanist (d. 1872)
January 23 - Alois Negrelli, Tyrolean engineer, railroad pioneer active in the Austrian Empire ( 1858)
January 31 - Rodolphe Töpffer, Swiss teacher, author, and artist (d. 1846)
February 4 - Almeida Garrett, Portuguese writer (d. 1854)
February 11 - Basil Moreau, founder of the Congregation of Holy Cross (d. 1873)
February 14 - Walenty Wa?kowicz, Polish painter (d. 1842)
February 27 - Edward Belcher, British admiral (d. 1877)
March 8 - Simon Cameron, American politician (d. 1889)
March 16 - Anna Atkins, British botanist (d. 1871)
March 20 - Karl August Nicander, Swedish poet (d. 1839)
March 22 - Friedrich Wilhelm Argelander, German astronomer (d. 1875)
March 28 - Karl Adolph von Basedow, German physician, noted for reporting the symptoms of Graves-Basedow disease (d. 1854)
March 29 - Edward Smith-Stanley, 14th Earl of Derby, Prime Minister of the United Kingdom (d. 1869)
April 12 - Henri Druey, Swiss Federal Councilor (d. 1855)
April 17 - Eliza Acton, English poet and cookery writer (d. 1859)
May 13 - Catherine Gore, English author (d. 1861)
May 20 - Honoré de Balzac, French author (d. 1850)
May 21 - Mary Anning, British paleontologist (d. 1847)
May 25 - Alexei Lvov, Russian composer (d. 1870)
June 3 - Elisabetta Fiorini Mazzanti, Italian botanist (d. 1879)
June 6 - Alexander Pushkin, Russian author (d. 1837)
June 18 - Prosper Ménière, French physician (d. 1862) June 25 - David Douglas, Scottish-born botanist (d. 1834)
July 4 - King Oscar I of Sweden and Norway (d. 1859)
July 6 - Michael Thomas Bass, English brewer (d. 1884)
August 7 - Willis Willard Elliott, American Confederate soldier (d. 1900)
August 12 - Patrick MacDowell, Irish sculptor (d. 1870)
September 8 - James Bowman Lindsay, Scottish inventor (d. 1862)
September 10 - George Willison Adams, American abolitionist (d. 1879)
October 1 - John Brown Russwurm, American abolitionist (d. 1851)
October 18 - Christian Friedrich Schönbein, German chemist (d. 1868)
October 26 - Margaret Agnes Bunn, British actress (d. 1883)
November 1 - Thomas Baldwin Marsh, American religious leader (d. 1866)
November 7 - James Syme, Scottish medical reformer (d. 1870)
November 29 - Amos Bronson Alcott, American philosopher, educator and writer, father of novelist Louisa May Alcott (d. 1888) December 3 - Peggy Eaton, born Margaret O'Neill, wife of United States Secretary of State John Eaton and central character of the Petticoat affair (d. 1879)
January 9 - Maria Gaetana Agnesi, Italian mathematician (b. 1718)
January 18 - Heinrich Johann Nepomuk von Crantz, Luxembourgian botanist (b. 1722)
January 22 - Horace-Bénédict de Saussure, Swiss aristocrat, alpinist (b. 1740)
January 26 - Gabriel Christie (British Army officer), British Army general (b. 1722)
February 6 - Étienne-Louis Boullée, French architect (b. 1728)
February 7 - Qianlong Emperor of China (b. 1711)
February 9 - Johann Baptist Babel, Swiss sculptor (b. 1716)
February 16 - Charles Theodore, Elector of Bavaria (b. 1724)
February 19 - Jean-Charles de Borda, French mathematician, physicist, political scientist, and sailor (b. 1733)
February 22 - Heshen, Manchu official under Qianlong (b. 1750)
February 24 - Georg Christoph Lichtenberg, German scientist, satirist, and Anglophile (b. 1742)
March 13 - Richard Hotham, English property developer and politician (b. 1722)
March 17 - Sir Charles Thompson, 1st Baronet, British admiral, politician (b. c. 1740)
March 28 - Etta Palm d'Aelders, Dutch-French feminist (b. 1743)
March 29 - Helena Dorothea von Schönberg, German industrialist (d. 1729)
April 3 - Pierre Charles Le Monnier, French astronomer (b. 1715)
April 6 - Alexander Bezborodko, Grand Chancellor of Russia, architect of Catherine the Great's foreign policy (b. 1747)
April 28 - Matthew Griswold (governor), 17th Governor of Connecticut (1784-1786) (b. 1714)
May 2 - Guemes Padilla Horcasitas, the Viceroy of New Spain (b. 1740)
May 4 - Tipu Sultan, Indian ruler (b. 1750)
May 18 - Pierre Beaumarchais, French writer (b. 1732)
May 22 - Toypurina, Medicine woman of the Tongva nation and rebel leader (b. 1750)
May 26 - James Burnett, Lord Monboddo, Scottish jurist (b. 1714)
May 30 - Robert McQueen, Lord Braxfield, Scottish advocate and judge (b. 1722)
June 6 - Patrick Henry, American revolutionary politician, Governor of Virginia (b. 1736)
June 10 - Chevalier de Saint-Georges, Guadeloupe-born French musician (b. 1745)
June 24 - Dunbar Douglas, 4th Earl of Selkirk, Scottish peer (b. 1722) June 30 - Francesco Caracciolo, Neapolitan admiral, revolutionist (b. 1752)
July 7 - William Curtis, English botanist, entomologist (b. 1746)
August 2 - Jacques Étienne Montgolfier, French inventor of the hot-air balloon, balloonist (b. 1744)
August 4 - John Bacon, British sculptor (b. 1740)
August 5 - Richard Howe, British admiral (b. 1726)
August 15 - Barthélemy Catherine Joubert, French general (b. 1769)
August 20 - Eleonora Fonseca Pimentel, Italian poet and revolutionary (b. 1752)
August 29 - Pope Pius VI (b. 1717)
August 31 - Nicolas-Henri Jardin, French architect (b. 1720)
October 6 - William Withering, British physician (b. 1741)
October 9 - Pierre Pigneau de Behaine, French priest who helped to establish the Nguy?n dynasty (b. 1741)
October 20 - James Iredell, Associate Justice of the Supreme Court of the United States (b. 1751)
October 24 - Carl Ditters von Dittersdorf, Austrian composer (b. 1739)
November 22 - Judith van Dorth, Dutch orangist (b. 1747)
November 23 - Mark Robinson (Royal Navy officer), Royal Navy admiral (b. 1722)
December 6 - Joseph Black, Scottish physician, physicist, and chemist (b. 1728)
December 14 - George Washington, military leader of the American Revolution, president of the Constitutional Convention (1787), and the 1st President of the United States (b. 1732)
December 18 - Jean-Étienne Montucla, French mathematician (b. 1725) December 31 - Jean-François Marmontel, French historian, writer (b. 1723)
"Historical Events for Year 1799 | OnThisDay.com". Historyorb.com . Retrieved 2016.
Nadaraja, T. (1972). The Legal System of Ceylon in Its Historical Setting. E. J. Brill. p. 181.
Formica, Marina (2004). "The Protagonists and the Principal Phases of the Roman Republic of 1798 to 1799". In Burton, Deborah; et al. (eds.). Tosca's Prism: Three Moments of Western Cultural History. Northeastern University Press. p. 67.
Woodbury, Robert S. (1960). "The Legend of Eli Whitney and Interchangeable Parts". . Technology and Culture 1.