This is a list of
selected that appears on the "On this day" section of the Main Page. To suggest a new item, in most cases you can April 20 anniversaries and edit this page. be bold Please read the 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 selected anniversaries guidelines before making your edit. talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative their subjects are. Only 5–6 events are posted at a time and thus not everything that is " article quality and to maintain a mix of topics, not based solely on how important or significant 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 20, 2019 featured article or the April 20, 2019 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.
Louis Pasteur cropped.jpg
Louis Pasteur (requires undeletion)
Portrait of Oliver Cromwell by Samuel Cooper
Vädersolstavlan, attributed to Urban målare
Red Army Faction logo, showing a Heckler & Koch MP5 submachine gun on top of a red star, overlaid with the letters "RAF"
title=Enoch Powell in 1987
1303 – Pope Boniface VIII issued a bull establishing what is now , today one of the largest universities in Europe.
Sapienza University of Rome refimprove section
1653 – Oliver Cromwell dissolved the of the Rump Parliament Commonwealth of England by force, eventually replacing it with the Barebone's Parliament.
1657 – Anglo-Spanish War: An English fleet under Admiral Robert Blake a attacked Spanish treasure fleet at Santa Cruz de Tenerife in the Spanish Canary Islands.
1792 – After Foreign Minister Charles François Dumouriez presented the French Legislative Assembly with a long list of grievances against Austria, France declared war to begin the .
French Revolutionary Wars refimprove section
1836 – The U.S. Congress passed an act creating the .
Wisconsin Territory unreferenced section
1862 – French chemist Louis Pasteur and physiologist Claude Bernard completed the first test on .
pasteurization date not in article; Pasteur listed on Sept 28 (death date); fact not in Bernard article
1884 – Pope Leo XIII published the encyclical , denouncing Humanum genus Freemasonry as well as a number of beliefs and practices purportedly associated with it such as popular sovereignty and the separation of church and state.
lots of assorted inline maintenance tags
1908 – of the The inaugural season New South Wales Rugby League premiership began with nine teams competing in Australia's first Rugby league football competition.
1912 – in Fenway Park Boston, Massachusetts, and in Tiger Stadium Detroit, Michigan, were opened.
Fenway: refimprove section;Tiger Stadium: refimprove
1914 – A fire and a gun battle between the Colorado National Guard and striking coal miners in Ludlow, Colorado, led to 17 deaths in the .
Ludlow Massacre refimprove section
1939 – Billie Holiday recorded her version of " ", which gained fame as an emblem of the Strange Fruit Civil Rights Movement.
1968 – succeeded Pierre Trudeau Lester B. Pearson as Prime Minister of Canada.
1998 – The violent German revolutionary group known as the announced that it had dissolved.
Red Army Faction refimprove section
1999 – Students Eric Harris and Dylan Klebold , killing 13 people and wounding over 20 others before committing suicide at embarked on a massacre Columbine High School in Columbine, Colorado.
: April 20 begins at sunset ( Ridván Bahá'í Faith); ( 4/20 cannabis culture)
(d. 689) Cædwalla of Wessex · (d. 1831) John Abernethy · (b. 1989)