Births on August 21

Guillaume Groen van Prinsterer, Dutch historian and politician (d. 1876)

Guillaume Groen van Prinsterer (21 August 1801 – 19 May 1876), Dutch politician and historian, was born at Voorburg, near The Hague.

1 Jan

United Kingdom of Great Britain and Ireland
The legislative union of Kingdom of Great Britain and Kingdom of Ireland is completed to form the United Kingdom of Great Britain and Ireland.
17 Feb

Thomas Jefferson
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.
23 Mar

Paul I of Russia
Tsar Paul I of Russia is struck with a sword, then strangled, and finally trampled to death inside his bedroom at St. Michael's Castle.
2 Apr

Battle of Copenhagen (1801)
French Revolutionary Wars: The British capture the Danish fleet.
10 May

Barbary pirates
First Barbary War: The Barbary pirates of Tripoli declare war on the United States of America.