Wikipedia:Selected anniversaries/April 21
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.
Images
Use only ONE image at a time
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Romulus and Remus -
Sam Houston -
Sam Houston -
Cathedral of Brasilia
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Nguyễn Văn Thiệu -
Maharlika (ruling class) of the Kingdom of Tondo -
Manfred von Richthofen, "The Red Baron"
Ineligible
| Blurb | Reason |
|---|---|
| Tiradentes Day in Brazil | multiple issues |
| Grounation Day in the Rastafari movement | reads like a story |
| Easter Monday (various countries, 2014) | refimprove sections |
| 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. | refimprove section, unreferenced section |
| 1934 – The "Surgeon's Photograph", purportedly showing the Loch Ness Monster (later revealed to be a hoax), was published in the Daily Mail. | refimprove section, neutrality issues, needs rewrite |
| 1967 – Colonel Georgios Papadopoulos overthrew the government of Greek Prime Minister Panagiotis Kanellopoulos, establishing the Regime of the Colonels. | refimprove sections |
Eligible
- 753 BC – Romulus and Remus legendarily founded Rome, according to the calculations by Roman scholar Varro Reatinus.
- 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.
- 1836 – Texan forces led by Sam Houston defeated General Antonio López de Santa Anna and his Mexican troops in the Battle of San Jacinto near La Porte, the decisive battle in the Texas Revolution.
- 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 World War I with 80 confirmed air combat victories.
- 1960 – Brasília, a planned city primarily designed by architect and urban planner Lúcio Costa, was officially inaugurated, replacing Rio de Janeiro as the capital of Brazil.
- 1962 – The Century 21 Exposition, the first world's fair in the United States since World War II, opened in Seattle.
- 1975 – Nguyễn Văn Thiệu resigned as President of South Vietnam, and was replaced by Trần Văn Hương, as communist forces closed in on victory.
- 1992 – Radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of two planets orbiting the pulsar PSR B1257+12, the first definitive detection of exoplanets.
- 900 – A debt was pardoned by the Datu of Tondo on the island of Luzon, as inscribed on the Laguna Copperplate Inscription, the earliest known written document found in the Philippines.
- 1509 – Henry VIII (pictured) became King of England, following the death of his father Henry VII, eventually becoming a significant figure in the history of the English monarchy.
- 1863 – After the Ottoman Empire exiled him from Baghdad, Bahá'u'lláh, the founder of the Bahá'í Faith, began his twelve-day stay in the Garden of Ridván where he declared his mission as "He whom God shall make manifest".
- 1914 – Mexican Revolution: The United States detained a German steamer carrying materiel for the Mexican federal government.
- 1970 – In response to a long-running dispute over wheat production quotas, the Principality of Hutt River proclaimed its secession from Western Australia.