Births on January 3

Douglas William Jerrold, English journalist and playwright (d. 1857)

Douglas William Jerrold (London 3 January 1803 – 8 June 1857 London) was an English dramatist and writer.

18 May

Treaty of Amiens
Napoleonic Wars: The United Kingdom revokes the Treaty of Amiens and declares war on France.
23 Sep

Battle of Assaye
Second Anglo-Maratha War: Battle of Assaye between the British East India Company and the Maratha Empire in India.
20 Oct

Louisiana Purchase
The United States Senate ratifies the Louisiana Purchase.