Wikipedia:Selected anniversaries/April 13
This is a list of selected April 13 anniversaries that appears on 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 soon will 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 5–6 events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is not generally posted this year if it is also the subject of the scheduled April 13, 2018 featured article or the April 13, 2018 featured picture.
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.
Use only ONE image at a time
Henry IV of france by pourbous younger cropped.jpg
Henry IV of France (requires undeletion)
|Thingyan begins in Myanmar;||refimprove|
|Cambodian New Year;||refimprove|
|Lao New Year in Laos;||refimprove|
|; Thai New Year's Day||unreferenced section|
|1873 – In the wake of a disputed election for local offices in Colfax, Louisiana, U.S., armed white supremacists overpowered freedmen and the African American state militia trying to control the parish courthouse, killing over 100 of them.||refimprove section|
|1919 – The Provisional Government of the Republic of Korea, a government in exile based in Shanghai during the Japanese occupation of Korea, was formed.||refimprove|
|1943 – The neoclassical Jefferson Memorial in Washington, D.C., was formally dedicated on the 200th anniversary of Thomas Jefferson's birth.||unreferenced section|
|1945 – World War II: Soviet and Bulgarian forces captured Vienna in Austria.||refimprove section|
|1953 – The CIA began Project MKUltra, an illegal, covert human research program into mind control.||refimprove esction|
|2015 – Czech politician Vít Jedlička proclaimed the micronation Liberland on a patch of land between Croatia and Serbia that had been unclaimed by either side due to a territorial dispute.||unreliable sources|
|April 13: Maundy Thursday (Christianity, 2017)||includes unreferenced/OR|
- 1777 – American Revolutionary War: British and Hessian forces conducted a surprise attack against a Continental Army outpost at Bound Brook, New Jersey.
- 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, Punjab, India.
- 1941 – The Soviet Union and the Empire of Japan signed a neutrality pact, which lasted through most of World War II.
- 1943 – World War II: German news announced the discovery of a mass grave in Katyn, Russia, of Polish prisoners of war killed by Soviet forces, causing a diplomatic rift between the Polish government-in-exile and the USSR.
- 1948 – A convoy bringing medical and fortification supplies and personnel to Hadassah Hospital on Mount Scopus was ambushed by Arab forces, leaving about eighty people dead.
- 1956 – The Vietnamese National Army captured Ba Cụt, military commander of the Hoa Hao religious sect, which ran a de facto state in southern Vietnam in opposition to Prime Minister Ngo Dinh Diem.
- 1958 – In the midst of the Cold War, American pianist Van Cliburn won the inaugural International Tchaikovsky Competition in Moscow.
- 2009 – Twenty-three people died in a homeless hostel fire in Kamień Pomorski, Poland, the country's deadliest fire since 1980.
- 1111 – Henry V, the last ruler of the Salian dynasty, was crowned Holy Roman Emperor.
- 1742 – Messiah, an oratorio by baroque composer George Frideric Handel, premiered in Dublin.
- 1829 – The Roman Catholic Relief Act was granted Royal Assent, removing the most substantial restrictions on Catholics in the United Kingdom.
- 1973 – Catch a Fire, the landmark reggae album by Bob Marley and the Wailers, was released.
- 1997 – In golf, twenty-one-year-old Tiger Woods (pictured) became the youngest player to win the US Masters, breaking the tournament's record for the lowest four-round score (270 strokes, 18 under par).
Catherine de' Medici (b. 1519) ·