Year 1801 (MDCCCI) was a common year starting on Thursday (link will display the full calendar) of the Gregorian calendar and a common year starting on Tuesday of the 12-day-slower Julian calendar. It was also the first year of the 19th century. The Union Flag, flag of the newly formed United Kingdom of Great Britain and Ireland.

Events

January–March

• January 1
  • The legislative union of Great Britain and Ireland is completed under the Act of Union 1800, bringing about the United Kingdom of Great Britain and Ireland.
  • Giuseppe Piazzi discovers the asteroid and former dwarf planet Ceres.
• January 3 – Toussaint L'Ouverture triumphantly enters Santo Domingo, the capital of the former Spanish colony of Santo Domingo, which has become a colony of Napoleonic France.
• January 21 – John Marshall is appointed Chief Justice of the United States.
• February 4 – William Pitt the Younger resigns as Prime Minister of the United Kingdom.
• February 16 – The Treaty of Lun ville ends the War of the Second Coalition between France and Austria.
• February 17 – An electoral tie between Thomas Jefferson and Aaron Burr is resolved, when Jefferson is elected President of the United States and Burr Vice President by the United States House of Representatives.
• February 27 – Washington, D.C. is placed under the jurisdiction of the Congress of the United States.
• March 4 – Thomas Jefferson succeeds John Adams as President of the United States of America.
• March 10 – The first census is held in Great Britain. The population of England and Wales is determined to be 8.9 million,^[1] with London revealed to have 860,035 residents. 1.5 million people live in cities of 20,000 or more in England and Wales, accounting for 17% of the total English population.
• March 14 – Henry Addington becomes First Lord of the Treasury and Chancellor of the Exchequer effectively Prime Minister of the United Kingdom.
• March 21 – Second Battle of Abukir in Egypt: British troops defeat the French, but the British commander, Sir Ralph Abercromby, dies later of a wound received in the action.
• March 23 – Tsar Paul I of Russia is murdered. He is succeeded by his son Alexander I.

April–June

• April 2 – First Battle of Copenhagen: The British fleet under Admiral Sir Hyde Parker, along with Admiral Horatio Nelson, attack Copenhagen; the Armed Neutrality of the North is dissolved.
• May 10 – The pascha of Tripoli declares war on the United States by having the flagpole on the consulate chopped down.
• June 7 – Portugal and Spain sign the Treaty of Badajoz; Portugal loses the city of Olivenza.
• June 15 – A bull breaks through barriers at a bullfight in Madrid, killing two people (including the mayor of Torrej n de Ardoz)^[2] and injuring a number of other spectators.
• June 27 – Cairo falls to British troops.

July–September

• July 6 – Battle of Algeciras: The French fleet defeats the British fleet.
• July 7 – Toussaint Louverture promulgates a reforming constitution for Santo Domingo, declaring himself emperor for life of the entire island of Hispaniola and nominally abolishing slavery.
• July 18 – Napoleon signs a Concordat with Pope Pius VII.
• September 30 – The Treaty of London is signed for preliminary peace between the First French Republic and the United Kingdom of Great Britain and Ireland.

October–December

• October 17 – A coup d' tat is staged in the Netherlands (Batavian Republic).
• November 16 – The first edition of New-York Evening Post is printed.

Date unknown

• The first census is held in France.
• Aachen is officially annexed by France.
• Joseph-Marie Jacquard develops a loom where the pattern being woven is controlled by punched cards.
• Philippe Pinel publishes Trait m dico-philosophique sur l'ali nation mentale; ou la manie, presenting his enlightened humane psychological approach to the management of psychiatric hospitals. Translated into English by D. D. Davis as Treatise on Insanity in 1806, it is influential on both sides of the Atlantic during the nineteenth century.^[3]
• Ultraviolet radiation is discovered by Johann Wilhelm Ritter.
• The magnum opus Disquisitiones Arithmeticae of Carl Friedrich Gauss is published.

Births

January–June

• January 3 – Gijsbert Haan, Dutch-American religious leader (d. 1874)
• January 14 – Jane Welsh Carlyle, wife of essayist Thomas Carlyle (d. 1866)
• February 1 – Thomas Cole, American artist (d. 1848)
• February 13 – J nos Kardos, Hungarian Slovenes evangelical priest, teacher and writer (d. 1875)
• February 21 – John Henry Newman, English Roman Catholic Cardinal (d. 1890)
• May 9 – Peter Hesketh-Fleetwood, English Member of Parliament and developer (d. 1866)
• May 11 – Henri Labrouste, French architect (d. 1875)
• May 17 – Lovisa rberg, first woman doctor and surgeon in Sweden (d. 1881)
• June 1 – Brigham Young, American religious leader and colonizer (d. 1877)
• June 4 – James Pennethorne, English architect (d. 1871)
• June 14 – Heber C. Kimball, American religious leader (d. 1868)
• June 30 – Frederic Bastiat, French philosopher (d. 1850)

July–December

• July 5 – David Farragut, American admiral (d. 1870)
• July 29 – George Bradshaw, English publisher (d. 1853)
• October 12 – Friedrich Frey-Heros , member of the Swiss Federal Council (d. 1873)
• November 3 – Karl Baedeker, German author and publisher (d. 1859)
• November 3 – Vincenzo Bellini, Italian composer (d. 1835)
• November 10 – Vladimir Dal, Russian lexicographer (d. 1872)
• November 13 – Queen Elisabeth Ludovika of Bavaria, queen of Prussia (d. 1873)
• December 11 – Christian Dietrich Grabbe, German writer (d. 1836)

Date unknown

• Dai Xi, Chinese painter (d. 1860)
• Franciszek Ksawery Godebski, Polish writer (d. 1869)

Deaths

January–June

• February 7 – Daniel Chodowiecki, Polish painter (b. 1726)
• March 19 – Ambrosio O'Higgins, Marquis of Osorno, Spanish viceroy of Peru and Governor of Chile, father of Bernardo O'Higgins
• March 21 – Andrea Luchesi, Italian composer (b. 1741)
• March 23 – Tsar Paul of Russia (b. 1754)
• March 25 – Novalis, German poet (b. 1772)
• March 28 – Ralph Abercromby, British general (b. 1734)
• April 2 – Thomas Dadford Junior, British engineer
• April 7 – No l Fran ois de Wailly, French lexicographer (b. 1724)
• May 17 – William Heberden, English physician (b. 1710)
• June 4 – Frederick Muhlenberg, first Speaker of the U.S. House of Representatives (b. 1750)
• June 14 – Benedict Arnold, American Revolution hero and traitor (b. 1741)

July–December

• September 19 – Johann Gottfried Koehler, German astronomer (b. 1745)
• October 3 – Philippe Henri, marquis de S gur, Marshal of France (b. 1724)
• November 4 – William Shippen, American physician and Continental Congressman (b. 1712)
• November 5 – Motoori Norinaga, Japanese philologist and scholar (b. 1730)
• November 24 – Franz Moritz Graf von Lacy, Austrian field marshal (b. 1725)

References

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