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Date |
Event(s) |
| 1 | 1801 | - 4 Mar 1801—3 Mar 1809: Thomas Jefferson, 3rd President of the United States
 Thomas Jefferson
- 17 Mar 1801—10 May 1804: Henry Addington, 1st Viscount Sidmouth, UK Prime Minister (Tory)
 Viscount Sidmouth
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| 2 | 1804 | - 1804: Matthew Flinders recommends that the newly discovered country, New Holland, be renamed "Australia"
- 21 Feb 1804: Richard Trevithick runs his railway engine on the Penydarren Railway (9.5 miles
from Pen-y-Darren to Abercynon in South Wales)
- 3 Mar 1804: John Wedgwood (eldest son of the potter Josiah Wedgwood) founds The Royal
Horticultural Society
- 10 May 1804—23 Jan 1806: William Pitt 'The Younger', UK Prime Minister (Tory)
 William Pitt the Younger
- 2 Dec 1804: Napoleon declares himself Emperor of the French
- 12 Dec 1804: Spain declares war on Britain
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| 3 | 1805 | - 1805: London docks opened
- 21 Oct 1805: Admiral Nelson's victory at Trafalgar
- 2 Dec 1805: Battle of Austerlitz; Napoleon defeats Austrians and Russians
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| 4 | 1806 | - 1806: Dartmoor Prison opened (built by French prisoners)
- 9 Jan 1806: Nelson buried in St Paul's cathedral, London
- 11 Feb 1806—31 Mar 1807: William Wyndham Grenville, 1st Baron Grenville, UK Prime Minister (Whig)
 William Wyndham Grenville, 1st Baron Grenville
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