1800s
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| Centuries: | 18th century - 19th century - 20th century |
| Decades: | 1770s 1780s 1790s - 1800s - 1810s 1820s 1830s |
| Years: | 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 |
Events and Trends
- Beginning of the Napoleonic Wars (1803 - 1815).
- Flag semaphore is adopted by navies.
- The Kingdom of Great Britain and the Kingdom of Ireland merge into the United Kingdom of Great Britain and Ireland in 1801.
World Leaders
- Emperor Napoleon I (First French Empire)
- Emperor Francis II (Holy Roman Empire)
- Pope Pius VII
- Emperor Alexander I (Russia)
- King Charles IV (Spain)
- King George III, (United Kingdom of Great Britain and Ireland)
- President John Adams (United States)
- President Thomas Jefferson (United States)
- Fath Ali Shah of Qajar dynasty (Persia)
Categories
Articles to be expanded | 1800s