1800s
| 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 | |
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Events and Trends
- Beginning of the Napoleonic Wars (1803 - 1815).
- 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.
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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)bg:1800-те
cy:1800au da:1800'erne de:1800er et:1800. aastad es:Años 1800 fr:Années 1800 ga:1800í io:1800a yari it:Anni 1800 lt:XIX amžiaus 1-as dešimtmetis nl:1800-10 ja:1800年代 no:1800-årene pl:Lata 1800-1809 ro:Anii 1800 ru:1800-е simple:1800s sl:1800. fi:1800-vuosikymmen sv:1800-talet (decennium) zh:1800年代