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 five to six 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 20 April 22 >

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Blurb Reason
Tiradentes Day in Brazil multiple issues
753 BCRomulus and Remus legendarily founded Rome, according to the calculations by Roman scholar Varro Reatinus. unreferenced section
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
1802 – Twelve thousand Wahhabis from the first Saudi State invaded the city of Karbala, killed several thousand inhabitants, and sacked the city. lead needs rewrite
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
1975Nguyễn Văn Thiệu resigned as President of South Vietnam, and was replaced by Trần Văn Hương, as communist forces closed in on victory. unreferenced section
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. lots of CN tags
2014 – The city of Flint, Michigan, U.S., changed its water source to the Flint River, which exposed residents to lead poisoning. multiple issues


April 21: First day of Ridván (Bahá'í Faith, 2019); Easter (Western Christianity, 2019); Mid-Sha'ban (Islam, 2019); Grounation Day in the Rastafari movement

Wignacourt Aqueduct
Wignacourt Aqueduct

Bardas (d. 866) · Petrus Apianus (d. 1552) · Cheryl Gillan (b. 1952)

More anniversaries: