1st January » The Dutch East India Company is dissolved.
21st March » With the church leadership driven out of Rome during an armed conflict, Pope Pius VII Pius VII is Papal Coronation crowned Pope in Venice with a Papier-mâché Tiara temporary papal tiara made of papier-mâché.
2nd April » Ludwig van Beethoven leads the premiere of his Symphony No. 1 (Beethoven) e.g First Symphony in Vienna.
24th April » The United States Library of Congress is established when President of the United States President John Adams signs legislation to appropriate $5,000 United States dollar USD to purchase "such books as may be necessary for the use of Congress of the Unite
15th May » King George III of the United Kingdom survives an assassination attempt by James Hadfield, who is later acquitted by reason of insanity.
7th June » David Thompson (explorer) known as David Thompson reaches the mouth of the Saskatchewan River in Manitoba.
14th June » The French Army of Napoleon known as First Consul Napoleon Bonaparte defeats the Austrians at the Battle of Marengo in Northern Italy and re-conquers Italy.
1st August » The Acts of Union 1800 is passed in which merges the Kingdom of Great Britain and the Kingdom of Ireland into the United Kingdom of Great Britain and Ireland.
30th August » Gabriel Prosser postpones a planned slave rebellion in Richmond, Virginia, but is arrested before he can make it happen.
4th September » The French garrison in Valletta surrenders to British troops who had been called at the invitation of the Maltese people or Maltese. The islands of Malta (island) named Malta and Gozo become the Malta Protectorate.
1st October » Spain cedes Louisiana (New France) e.g Louisiana to France via the Third Treaty of San Ildefonso named Treaty of San Ildefonso.
17th October » Kingdom of Great Britain called Britain takes control of the Dutch colony of Curaçao.
1st November » John Adams becomes the first President of the United States to live in the Executive Mansion (later renamed the White House).
17th November » The United States Congress holds its first session in Washington, D.C..
Famous Birthdays in 1800
7th January » Millard Fillmore, American politician, 13th President of the United States (d. 1874)
11th January » Ányos Jedlik, Hungarian physicist (d. 1895)
14th January » Ludwig Ritter von Köchel, Austrian composer, botanist, and publisher (d. 1877)
6th February » Achille Devéria, French painter (d. 1857)
9th February » Hyrum Smith, American religious leader (d. 1844)
11th February » Henry Fox Talbot, English photographer, invented the calotype (d. 1877)
14th February » Emory Washburn, American historian, lawyer, and politician, 22nd Governor of Massachusetts (d. 1877)
19th February » Émilie Gamelin, Canadian nun, founded the Sisters of Providence (Montreal, Quebec) called Sisters of Providence (d. 1851)
2nd March » Evgeny Baratynsky, Russian poet (d. 1844)
3rd March » Heinrich Georg Bronn, German geologist (d. 1862)