Editing 1818 (section)

=== January–March ===
* [[January 1]] 
** [[Battle of Koregaon]]: Troops of the [[British East India Company]] score a decisive victory over the [[Maratha Confederacy|Maratha Empire]]. 
** English author [[Mary Shelley]] publishes the novel ''[[Frankenstein]]'' anonymously.
* [[January 3]] (21:52 UTC) – [[Venus]] [[Occultation|occults]] [[Jupiter]]. It is the last occultation of one planet by another before [[November 22]], [[2065]].
* [[January 6]] – The Treaty of Mandeswar brings an end to the [[Third Anglo-Maratha War]], ending the dominance of [[Maratha]]s, and enhancing the power of the [[British East India Company]], which controls territory occupied by 180&nbsp;million [[Demographics of India|Indians]].
* [[January 12]] – The [[Dandy horse]] (''Laufmaschine'' bicycle) is patented by [[Karl Drais]] in [[Mannheim]].<ref>{{cite web|title=Patent for Drais' "Laufmaschine", the ancestor of all bicycle|url=https://www.dpma.de/english/our_office/publications/news/milestones/200jahrepatentfuerdasur-fahrrad/index.html|website=Deutsches Patent- und Markenamt|accessdate=2021-06-26}}</ref>
* [[February 3]] – Jeremiah Chubb is granted a British patent for the [[Chubb detector lock]].<ref>{{cite web|url=http://www.chubbarchive.co.uk/page5.html|work=Chubb Archive|title=A Brief History of Chubb 1818–1990s|access-date=2018-12-16}}</ref>
* [[February 4]] – Writer [[Walter Scott]] finds the [[Honours of Scotland]] in [[Edinburgh Castle]].
* [[February 5]] – Upon his death, King [[Charles XIII of Sweden]] (Charles II of Norway) is succeeded on both thrones by his adoptive son [[Charles XIV John of Sweden|Charles XIV/III John]], starting the Royal [[House of Bernadotte]].
* [[February 11]] – [[Marie André Cantillon]] attempts to assassinate the [[Duke of Wellington]] in Paris.
* [[February 12]] – [[Chilean Declaration of Independence]] from Spain is proclaimed in [[Chile]].
* [[March 15]] – [[Seminole Wars#First Seminole War|First Seminole War]]: General [[Andrew Jackson]] and his American army invade [[Florida]].{{cn|date=January 2024}}
* [[March 22]] – [[Easter Sunday]] in [[Western Christianity]] falls on its earliest possible date. In Western Christianity, it will not occur on this date again until [[2285]].