Wikipedia:Selected anniversaries/April 13

This is a list of selected April 13 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	April 14 →

Staging area

Images

Use only ONE image at a time

• 
  Henry IV of France
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  Henry IV of France
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  Ba Cụt
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  Van Cliburn
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  Tiger Woods in 1997
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  George Frideric Handel
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  Damage caused by the Kamień Pomorski homeless hostel fire

Ineligible

Blurb	Reason
Thingyan begins in Myanmar;	refimprove
Cambodian New Year;	refimprove
Lao New Year in Laos;	refimprove
; Thai New Year's Day	refimprove section
1111 – Henry V, the last ruler of the Salian dynasty, was crowned Holy Roman Emperor.	page numbers needed
1873 – In the wake of a disputed election for local offices in Colfax, Louisiana, armed white supremacists overpowered freedmen and the African-American state militia trying to control the parish courthouse, killing over 100 of them.	multiple issues
1919 – The Provisional Government of the Republic of Korea, a government in exile based in Shanghai during the Japanese occupation of Korea, was formed.	unreferenced section, self-reference
1919 – British Indian Army troops massacred hundreds of unarmed men, women and children who were attending a peaceful gathering at the Jallianwala Bagh in Amritsar.	trivial popular culture listings
1941 – The Soviet Union and Japan signed a neutrality pact that lasted through most of World War II.	refimprove section
1943 – World War II: German news announced the discovery of a mass grave of Polish prisoners of war killed by Soviet forces in Katyn, Russia, causing a diplomatic rift between the Polish government-in-exile and the Soviet Union.	expansion
1945 – World War II: Soviet and Bulgarian forces captured Vienna in Austria.	refimprove section
1948 – Civil war in Mandatory Palestine: A convoy bringing supplies and personnel to Jerusalem's Hadassah Hospital was ambushed by Arab forces, leaving 79 people dead.	tagged for primary sources
1984 – Kashmir conflict: Indian forces launched a pre-emptive attack on the disputed Siachen Glacier in Kashmir, triggering a military conflict with Pakistan.	a bunch of inline tags (page/full citation needed)
2015 – Czech politician Vít Jedlička proclaimed the creation of the micronation Liberland on a patch of land between Croatia and Serbia that had been unclaimed by either side due to a territorial dispute.	refimprove section, outdated

Eligible

• 1777 – American Revolutionary War: British and Hessian forces conducted a surprise attack against a Continental Army outpost at Bound Brook, New Jersey.
• 1829 – The Roman Catholic Relief Act received royal assent, removing the most substantial restrictions on Catholics in the United Kingdom.
• 1849 – During a closed session of the Diet of Hungary, Lajos Kossuth presented the Hungarian Declaration of Independence from the Habsburg monarchy.
• 1942 – Austrian soldier Anton Schmid was executed for rescuing Jews from the Ponary massacre in Vilnius.
• 1953 – Ian Fleming's novel Casino Royale was published as the first work to feature the British spy character James Bond.
• 1953 – The CIA began Project MKUltra, an illegal, covert human research program into mind control.
• 1956 – The Vietnamese National Army captured Ba Cụt, a military commander of the religious sect Hòa Hảo, which ran a de facto state in South Vietnam in opposition to Prime Minister Ngô Đình Diệm.
• 1958 – In the midst of the Cold War, American pianist Van Cliburn won the inaugural International Tchaikovsky Competition in Moscow.
• 1973 – Catch a Fire, the landmark reggae album by Bob Marley and the Wailers, was released.
• 1976 – Forty people died in an explosion at an ammunition factory in Lapua, Finland.
• 1997 – In golf, 21-year-old Tiger Woods became the youngest player to win the Masters Tournament, breaking the record for the lowest four-round score.
• 2009 – Twenty-three people died in a fire at a homeless hostel (aftermath pictured) in Kamień Pomorski; it was Poland's deadliest fire since 1980.
• Born/died: | Catherine de' Medici |b|1519| Arthur Herbert, 1st Earl of Torrington |d|1716| William Garrow |b|1760| Pierre Gaspard Chaumette |d|1794| Henry De la Beche |d|1855| Stanisław Ulam |b|1909| Stanley Donen |b|1924| Seamus Heaney |b|1939| Max Mosley |b|1940| Annie Jump Cannon |d|1941| Max Weinberg |b|1951| John Swinney |b|1964| Abdul Salam Arif |d|1966| Danie Mellor |b|1971| Günter Grass |d|2015

Notes

• Henry V of England appears on April 9, so to avoid confusion, Henry V HRE should not appear in the same year.
• Serse appears on April 15 so the Messiah blurb should not appear in the same year.

April 13: Vaisakhi (Sikhism, 2024)

Jefferson Memorial

• 1742 – The first performance of George Frideric Handel's celebrated oratorio Messiah took place in Dublin.
• 1943 – The Neoclassical Jefferson Memorial (pictured) in Washington, D.C., was formally dedicated on the 200th anniversary of Thomas Jefferson's birth.
• 1946 – Nakam, a Jewish organization seeking revenge for the Holocaust, attempted to poison thousands of SS prisoners at Langwasser internment camp, but did not kill anyone.
• 2009 – Andrew Hussie's webcomic Homestuck debuted, and concluded on the same day in 2016.
• 2017 – War in Afghanistan: In an airstrike in Nangarhar Province, the U.S. military dropped the most powerful conventional bomb used in combat.

• Arthur Matthew Weld Downing (b. 1850)
• Joe Hewitt (b. 1901)
• Evelyne Daitz (b. 1936)

More anniversaries:

• April 12
• April 13
• April 14