Wikipedia:Selected anniversaries/May 21

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This is a list of selected May 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.

< May 20 May 22 >


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Images

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Ineligible

Blurb Reason
Navy Day in Chile; refimprove
996Pope Gregory V crowned Otto III as Holy Roman Emperor. refimprove section
1674John III Sobieski, elected by the szlachta, became the monarch of the Polish–Lithuanian Commonwealth. unreferenced section
1758French and Indian War: Ten-year-old Mary Campbell, taken captive from her Pennsylvania home by members of the Native American group Lenape, likely became the first white child to travel to the Connecticut Western Reserve. refimprove, lead too short
1863 – The Seventh-day Adventist Church, a Protestant denomination distinguished by its emphasis on the imminent second coming (Advent) of Jesus, was founded in Battle Creek, Michigan, U.S. CN tags (equivalent to refimprove section)
1879War of the Pacific: Two Peruvia] ironclads led by Miguel Grau Seminario attempted to lift the blockade of Iquique by Chilean battleships under Arturo Prat at the Battle of Iquique. refimprove
1881Clara Barton founded the American Red Cross in Washington, D.C. refimprove section
1979Riots erupted in San Francisco after former Supervisor Dan White was only sentenced for voluntary manslaughter for the assassinations of Mayor George Moscone and openly gay Supervisor Harvey Milk. misleading section
1982Falklands War: The United Kingdom began a major amphibious assault on the shores of San Carlos Water. refimprove
1904 – The Fédération Internationale de Football Association, the international sport governing body of association football, was founded in Paris. refimprove section
1996Algerian Civil War: The remains of seven French Trappist monks who had been kidnapped in Algeria nearly two months earlier were found. most important part uses an unreliable source
2006 – The Montenegrin independence referendum was held in Montenegro, with 55.5 percent of the voters favouring independence from the State Union of Serbia and Montenegro. refimprove section
2010 – The Japan Aerospace Exploration Agency launched IKAROS, the first spacecraft to successfully demonstrate solar sail technology in interplanetary space. featured on December 8

Eligible

May 21

Kingda Ka roller coaster
Kingda Ka roller coaster

Olaf the Black (d. 1237) · Rudolf Koller (b. 1828) · Nadine Dorries (b. 1957)

More anniversaries: