| Date | Place | Event | | 0788-09-23 | Northumbria | King Ælwald I killed. https://en.wikipedia.org/wiki/%C3%86lfwald_I_of_Northumbria |
| 0867-09-23 | Byzantine Empire | Emperor Michael III assassinated, Basil I became Emperor. https://en.wikipedia.org/wiki/Michael_III https://en.wikipedia.org/wiki/Basil_I |
| 1122-09-23 | Germany | Concordat of Worms signed. https://en.wikipedia.org/wiki/Concordat_of_Worms |
| 1253-09-23 | Bohemia | Wenceslaus I died, Ottakar II became King. https://en.wikipedia.org/wiki/Wenceslaus_I_of_Bohemia https://en.wikipedia.org/wiki/Ottokar_II_of_Bohemia |
| 1313-09-23 | England | Twelfth Parliament of Edward II assembled. https://en.wikipedia.org/wiki/List_of_parliaments_of_England#Parliaments_of_Edward_II |
| 1327-09-23 | England | Second Parliament of Edward III dissolved. https://en.wikipedia.org/wiki/List_of_parliaments_of_England#Parliaments_of_Edward_III |
| 1334-09-23 | YORK | Thirteenth Parliament of Edward III dissolved at York. https://en.wikipedia.org/wiki/List_of_parliaments_of_England#Parliaments_of_Edward_III |
| 1338-09-23 | Netherlands | Battle of Arnemuiden (Hundred Years’ War). http://en.wikipedia.org/wiki/Battle_of_Arnemuiden |
| 1408-09-23 | Belgium | Battle of Othee. https://en.wikipedia.org/wiki/Battle_of_Oth%C3%A9e |
| 1409-09-23 | Mongolia | Battle of Kherlen. https://en.wikipedia.org/wiki/Battle_of_Kherlen |
| 1461-09-23 | Navarre | Charles IV died, Blanche II became Queen. https://en.wikipedia.org/wiki/Charles,_Prince_of_Viana https://en.wikipedia.org/wiki/Blanche_II_of_Navarre |
| 1513-09-23 | France | Siege of Tournai ended (War of the League of Cambrai). https://en.wikipedia.org/wiki/Battle_of_the_Spurs#Siege_of_Tournai |
| 1549-09-23 | England | Battle of Blore Heath (War of the Roses), in Staffordshire. http://www.battlefieldstrust.com/resource-centre/warsoftheroses/battleview.asp?BattleFieldId=6 |
| 1568-09-23 | New Spain (Mexico) | Battle of San Juan de Ulúa (Anglo-Spanish War). http://www.loc.gov/rr/rarebook/catalog/drake/drake-2-unfortunatevoy.html https://en.wikipedia.org/wiki/Battle_of_San_Juan_de_Ul%C3%BAa_(1568) |
| 1616-09-23 | YORK | Henry Musgrave and George Ridley were executed at St. Leonard’s Gallows. http://pastsearch-archaeo-history.co.uk/wp-content/uploads/2012/01/Criminals-and-Executions-Jan12.pdf
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| 1641-09-23 | England | The Merchant Royal sank off Land’s End. http://www.wrecksite.eu/wreck.aspx?14252 http://www.telegraph.co.uk/news/uknews/1552050/Hoard-of-treasure-found-on-wreck-off-Cornwall.html |
| 1642-09-23 | England | Battle of Powick Bridge (First English Civil War). http://www.battlefieldstrust.com/resource-centre/civil-war/battleview.asp?BattleFieldId=35 https://en.wikipedia.org/wiki/Battle_of_Powick_Bridge |
| 1760-09-23 | Prussia | Second Siege of Kolberg ended (Seven Years’ War). https://en.wikipedia.org/wiki/Siege_of_Kolberg_(Seven_Years%27_War)#Second_siege_.281760.29 |
| 1779-09-23 | Great Britain | Battle of Flamborough Head (Anglo-French War). https://pastsearch-archaeo-history.co.uk/2019/09/battle-of-flamborough-head/ http://www.usna.edu/Users/oceano/pguth/website/shipwrecks/battle_lesson/battle_lesson.htm https://en.wikipedia.org/wiki/Battle_of_Flamborough_Head
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| 1803-09-23 | India | Battle of Assaye (Second Anglo-Maratha War). http://www.britishbattles.com/second-mahratta/assaye.htm |
| 1821-09-23 | Greece | Siege of Tripolitsa ended (Greek War of Independence). https://en.wikipedia.org/wiki/Siege_of_Tripolitsa |
| 1823-09-23 | YORK | Yorkshire Music Festival revived. https://www.british-history.ac.uk/vch/yorks/city-of-york/pp531-535#h3-0003
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| 1864-09-23 | USA | Battle of Sulphur Creek Trestle began (American Civil War). https://en.wikipedia.org/wiki/Battle_of_Sulphur_Creek_Trestle |
| 1868-09-23 | Puerto Rico | Grito de Lares began. http://en.wikipedia.org/wiki/Grito_de_Lares |
| 1873-09-23 | USA | Yellowstone Expedition ended. https://en.wikipedia.org/wiki/Yellowstone_Expedition_of_1873 |
| 1889-09-23 | Japan | Nintendo founded, making playing cards games. http://en.wikipedia.org/wiki/Nintendo |
| 1899-09-23 | Philippines | Battle of Olongapo ended (Philippine-American War). https://en.wikipedia.org/wiki/Battle_of_Olongapo |
| 1908-09-23 | Canada | University of Alberta founded. http://www.ualbertacentennial.ca/history/founding/index.html |
| 1913-09-23 | Tunisia | Roland Garros became first person to fly across Mediterranean Sea (St. Raphael, France to Bizerte). http://en.wikipedia.org/wiki/Roland_Garros_(aviator) |
| 1923-09-23 | YORK | York City Library, Museum Street, opened. http://www.rowntreesociety.org.uk/city-library-museum-street-today-york-explore/ |
| 1927-09-23 | YORK | York City Library, Museum Street, opened. http://www.rowntreesociety.org.uk/city-library-museum-street-today-york-explore/
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| 1932-09-23 | Saudi Arabia | Created from renaming Kingdom of Hejaz and Nejd. http://www.britannica.com/EBchecked/topic/525348/Saudi-Arabia/45230/The-Kingdom-of-Saudi-Arabia |
| 1940-09-23 | Germany | RAF bombed Berlin. http://ww2db.com/battle_spec.php?battle_id=55/Bombing-of-Hamburg-Dresden-and-Other-Cities-World-War-II-Database |
| 1942-09-23 | Germany | RAF bombers attacked Wisma, Flensburg & Vegesack (WWII). http://ww2db.com/battle_spec.php?battle_id=55/Bombing-of-Hamburg-Dresden-and-Other-Cities-World-War-II-Database |
| 1942-09-23 | Solomon Islands | Second Battle of Matanikau began (WWII). https://en.wikipedia.org/wiki/Actions_along_the_Matanikau#September_action |
| 1943-09-23 | Fiji | RNZAF plane crashed at Lauthala Bay, 4 killed (WWII). http://aviation-safety.net/database/record.php?id=19430923-1 |
| 1943-09-23 | USA | USAAF plane crashed at McCloud, CA, 5killed (WWII). http://aviation-safety.net/database/record.php?id=19430923-0 |
| 1944-09-23 | Mexico | Mexicana de Aviacion crashed near Tlanalapa, Hidalgo, 1 killed. http://aviation-safety.net/database/record.php?id=19440923-11 |
| 1944-09-23 | Netherlands | RAF plane shot down at Oosterbeek, 2 killed (Operation Market Garden – WWII). http://aviation-safety.net/database/record.php?id=19440923-9 |
| 1944-09-23 | Netherlands | USAAF plane shot down at Boxtel, 2 killed (Operation Market Garden – WWII). http://aviation-safety.net/database/record.php?id=19440923-3 |
| 1950-09-23 | Korea | Battle of Hill 282 (Korean War). https://en.wikipedia.org/wiki/Battle_of_Hill_282 |
| 1965-09-23 | South Asia | Indo-Pakistani War ended. https://en.wikipedia.org/wiki/Indo-Pakistani_War_of_1965 |
| 1968-09-23 | South Vietnam | Tet Offensive, Phase 3 ended (Vietnam War). https://en.wikipedia.org/wiki/Tet_Offensive |
| 1969-09-23 | USA | Chicago Eight trial began. http://law2.umkc.edu/faculty/projects/ftrials/chicago7/chicago7.html
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| 1983-09-23 | United Arab Emirates | Gulf Air Flight 771 crashed following bomb explosion, at Mino Jebel Ali, 112 killed. http://aviation-safety.net/database/record.php?id=19830923-0 |
| 1983-09-23 | Saint Kitts and Nevis | Joined the United Nations. https://www.un.org/en/member-states/ |
| 1992-09-23 | UK | Provisional IRA bombing of forensic laboratories in Belfast, Northern Ireland. http://www.independent.co.uk/news/uk/ira-blast-damages-over-1000-homes-1553260.html |
| 2000-09-23 | UK | Earthquake measuring 4.2Mw, epicentre in Warwick. https://www.ourwarwickshire.org.uk/content/article/warwick-earthquake-september-2000 https://en.wikipedia.org/wiki/List_of_earthquakes_in_the_British_Isles#20th_century |
| 2008-09-23 | Finland | Kauhajoki School shooting, 10 killed. http://news.bbc.co.uk/1/hi/world/europe/7630969.stm |
| 2016-09-23 | USA | Cascade Mall Shooting, 5 killed. https://en.wikipedia.org/wiki/Cascade_Mall_shooting |
| 2020-09-23 | UK | Earthquake measuring 1Mw, epicentre in Glenelg, Highlands. |
