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1805 (MDCCCV) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1805th year of the Common Era (CE) and Anno Domini (AD) designations, the 805th year of the 2nd millennium, the 5th year of the 19th century, and the 6th year of the 1800s decade. As of the start of 1805, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
After thirteen years the First French Empire abolished the French Republican Calendar in favour of the Gregorian calendar.
- October 14 – Napoleonic Wars: War of the Third Coalition – Ulm Campaign: Battle of Elchingen – An Austrian corps under Johann von Riesch is defeated by Marshal Ney, near Elchingen, Bavaria.
- October 16–19 – War of the Third Coalition: Ulm Campaign – Battle of Ulm: Austrian General Mack von Leiberich is forced to surrender his entire army to Napoleon, after being surrounded.
- October 21 – Napoleonic Wars: War of the Third Coalition – Battle of Trafalgar: The British fleet, led by Admiral Horatio Nelson, defeats a combined French and Spanish fleet off the coast of Spain; however, Admiral Nelson is fatally shot.
- October 23 – On the early death of her husband, Madame Clicquot Ponsardin takes over his champagne wine business in France as Veuve Clicquot.
- October 31 – Sweden, led by King Gustav IV Adolf, declares war on France.
- November 7 – The Lewis and Clark Expedition arrives at the Pacific Ocean.
- November 11 – Napoleonic Wars: Battle of Dürenstein – 8,000 French troops attempt to slow the retreat of a vastly superior Russian and Austrian force.
- November 16 – Napoleonic Wars: Battle of Schöngrabern – Russian forces, under Pyotr Bagration, delay the pursuit by French troops under Joachim Murat.
- November 20 – Beethoven's only opera Fidelio, in its original form (known retrospectively as Leonore), is premiered at the Theater an der Wien in Vienna, which at this time is under French military occupation.
- November 26 – The Pontcysyllte Aqueduct is opened in Wales; it is 1,007 ft (307 m) long and 126 ft (38 m) tall.
- January 8 – Orson Hyde, American religious leader (d. 1878)
- January 27 – Samuel Palmer, English artist (d. 1881)
- February 13 – Peter Gustav Lejeune Dirichlet, German mathematician (d. 1859)
- February 18 – Louis M. Goldsborough, United States Navy admiral (d. 1877)
- March 3 – Jonas Furrer, first President of the Swiss Confederation (d. 1861)
- March 14 – Eduard Clam-Gallas, Austrian general (d. 1891)
- March 22 – Benito de Soto, Galician pirate (executed 1830)
- March 23 – Sears Cook Walker, American mathematician, astronomer (d. 1853)
- March 26 (alleged) – Shirali Muslimov, Azerbaijani supercentenarian (d. 1973)
- April 2 – Hans Christian Andersen, Danish writer (d. 1875)
- April 8 – Hugo von Mohl, German botanist (d. 1872)
- April 22 – Benito de Soto, Galician pirate (d. 1830)
- June 9 – José Trinidad Cabañas, Honduran general, president and national hero (d. 1871)
- June 22 – Giuseppe Mazzini Italian patriot, statesman and writer (d. 1872)
- July 5 – Robert FitzRoy, English meteorologist, captain and politician (d. 1865)
- July 29 – Alexis de Tocqueville, French historian (d. 1859)
- July 30 – Rudolf Wagner, German anatomist, pathologist (d. 1864)
- August 4 – William Rowan Hamilton, Irish physicist (d. 1865)
- September 19 – John Stevens Cabot Abbott, American historian, pastor and pedagogical writer (d. 1877)
- September 27 – George Müller, Prussian evangelist, founder of the New Orphan Houses, Ashley Down, Bristol in England (d. 1898)
- November 14 – Fanny Mendelssohn, German composer, pianist (d. 1847)
- November 28 – John Lloyd Stephens, American traveler, diplomat and Mayanist archaeologist (d. 1852)
- December 2 – Cicero Price, American commodore (d. 1888)
- December 10 – William Lloyd Garrison, American abolitionist (d. 1879)
- December 12 – Henry Wells, American businessman, founder of Wells Fargo (d. 1878)
- December 22 – John Obadiah Westwood, English entomologist (d. 1893)
- December 23 – Joseph Smith, American religious leader, founder of The Church of Jesus Christ of Latter Day Saints Church and Latter Day Saint movement (d. 1844)
- December 31 – Jeanne Deroin, French socialist and feminist (d. 1894)
- January 7 – Ebenezer Sproat, American Continental Army officer, pioneer to the Ohio Country (b. 1752)
- January 9 – Noble Wimberly Jones, American Continental Congressman (b. 1723)
- January 17 – Paschen von Cossel, German lawyer (b. 1714)
- January 18 – John Moore (archbishop of Canterbury) (b. 1730)
- January 23 – Claude Chappe, French telecommunication pioneer (b. 1763)
- February 2 – Thomas Banks, English sculptor and artist (b. 1735)
- February 11 – Queen Jeongsun, Korean regent (b. 1745)
- February 20 – Justus Claproth, German jurist, inventor of the de-inking process of recycled paper (b. 1728)
- February 25 – Thomas Pownall, English colonial statesman (b. 1722)
- March 4 – Jean-Baptiste Greuze, French painter (b. 1725)
- May 7 – William Petty, 2nd Earl of Shelburne, Prime Minister of the United Kingdom (b. 1737)
- May 9 – Friedrich Schiller, German playwright (b. 1759)
- May 12 – Ferdinand von Hompesch zu Bolheim, 71st Grandmaster of the Order of Malta (b. 1744)
- May 25
- May 28 – Luigi Boccherini, Tuscan-born composer (b. 1743)
- June 3 – Princess Louise of Saxe-Meiningen, Landgravine of Hesse-Philippsthal-Barchfeld (b. 1752)
- June 18 – Arthur Murphy, Irish writer (b. 1727)
- June 19 – Louis-Jean-François Lagrenée, French painter (b. 1724)
- ^ Karen Jones and John Wills, The American West: Competing Visions (Edinburgh University Press, 2009) p17
- ^ Kinley Brauer and William E. Wright, Austria in the Age of the French Revolution, 1789-1815 (Berghahn Books, 1990) p11
- ^ "Baird, David", in A New General Biographical Dictionary, Volume 3, ed. by Hugh James Rose (T. Fellowes, 1857) p20
- ^ Tales of the Wars; Or, Naval and Military Chronicle (William Mark Clark, 1836) p329
- ^ The Englishman's library: comprising a series of historical, biographical, and national information (Charles Knight, 1824) p165
- ^ H. Arnold Barton, Scandinavia in the Revolutionary Era: 1760-1815 (University of Minnesota Press, 1986) p267
- ^ Thomas Carlyle, The French Revolution (Courier Corporation, 2012) p210