Wikipedia:Selected anniversaries/April 12
This is a list of selected April 12 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
April 12: Easter (Western Christianity, 2009); Palm Sunday (Eastern Christianity, 2009); Cosmonautics Day in Russia; Yuri's Night
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- 467 – Anthemius became Emperor of the Western Roman Empire.
- 1204 – Alexios V fled Constantinople as forces under Boniface the Marquess of Montferrat and Enrico Dandolo the Doge of Venice entered and sacked the Byzantine capital, effectively ending the Fourth Crusade.
- 1606 – A royal decree established the Union Flag (pictured) to symbolise the Union of the Crowns, merging the designs of the Flag of England and the Flag of Scotland.
- 1861 – Confederate forces began firing at Fort Sumter in the harbor of Charleston, South Carolina, starting the American Civil War.
- 1927 – Chinese Civil War: A large-scale purge of communists from the nationalist Kuomintang began in Shanghai.
- 1961 – Aboard Vostok 3KA-2, Soviet cosmonaut Yuri Gagarin became the first man to enter outer space, completing one orbit in a time of 108 minutes.