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Wikipedia:Selected anniversaries/April 21

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This is a list of selected April 21 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, featured list 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 20 April 22
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Ineligible

Blurb Reason
Patriots' Day in various U.S. states (1775) Place holder for 2025 (3rd Monday)
Tiradentes Day in Brazil multiple issues
Rama Navami - Hinduism Hindu calendar
1782 – A city pillar was erected on Rattanakosin Island, located on the eastern bank of the Chao Phraya River, an act considered the founding of the city of Bangkok. refimprove section
1894 – Norway formally adopted the Krag–Jørgensen, a repeating bolt action rifle designed by the Norwegians Ole Herman Johannes Krag and Erik Jørgensen, as the main firearm of its armed forces. needs more footnotes, unreferenced section
1918 – Manfred von Richthofen, known as the "Red Baron", was shot down and killed near Vaux-sur-Somme in France, after a career as the most successful fighter pilot of First World War with 80 confirmed air combat victories. refimprove section
1960Brasília, a planned city primarily designed by architect and urban planner Lúcio Costa, was officially inaugurated, replacing Rio de Janeiro as the capital of Brazil. unreferenced section
1967 – Colonel Georgios Papadopoulos overthrew the government of Greek Prime Minister Panagiotis Kanellopoulos, establishing the Regime of the Colonels. refimprove sections
1967 – The Socialist mayor of Marseille Gaston Defferre and Gaullist legislator René Ribière took up swords in the last duel fought in France. Defferre: unreferenced section; Ribière: stub
2002 – In the first round of the French presidential election, Jean-Marie Le Pen progressed to the runoff, a result so surprising that "21st of April" is now a common expression in France. Election: refimprove section, fact not in article; Le Pen: lots of CN tags (8)
* 1863 – Following his exile from Baghdad, Baháʼu'lláh, the founder of the Baháʼí Faith, began a twelve-day stay in the Garden of Ridván, where he declared himself to be "He whom God shall make manifest". article says 22 April
* 1914Mexican Revolution: The United States detained a German steamer carrying materiel for the Mexican federal government. One section almost uncited
Grounation Day (Rastafari Citation needed for date in article

Eligible

April 21

Wignacourt Aqueduct
Wignacourt Aqueduct
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