1122
Concordat of Worms
Event · Europe
On this day
23 September
344 events in the atlas are dated to 23 September, from 855 CE to 2026. The best known come first; below them is every one, age by age, the most significant first.
- 344 events
- 855 – 2026 CE
The best known
From every age and part of the world1687
Siege of the Acropolis
Siege · Europe
1803
Battle of Assaye
Battle · South Asia
1920
Turkish–Armenian War
War · Middle East
2022
Hurricane Ian
Natural disaster · Mesoamerica and the Caribbean
2026
2026 Ethiopian offensive
Rebellion · Sub-Saharan Africa
The Middle Ages
501 – 1500 CE · 18 events- 1122Concordat of WormsEvent · Europe
- 855 CETreaty of PrümTreaty · Europe
- 1338Battle of ArnemuidenBattle · Europe
- 1459Battle of Blore HeathBattle · Europe
- 1463Siege of JajceSiege · Europe
- 1409Battle of KherlenBattle · East Asia
- 1403Founding of GiurgiuFounding · Europe
- 1438Battle of SellnitzBattle · Europe
- 1408Battle of OthéeBattle · Europe
- 1325Battle of AltopascioBattle · Europe
Early modern times
1501 – 1800 · 20 events- 1687Siege of the AcropolisSiege · Europe
- 1642Battle of Powick BridgeBattle · Europe
- 1779Battle of Flamborough HeadBattle · Europe
- 1568Battle of San Juan de UlúaBattle · Mesoamerica and the Caribbean
- 1669Founding of University of ZagrebFounding · Europe
- 1751Siege of ArcotSiege · South Asia
- 1597Siege of NamwonSiege · East Asia
- 1588Siege of Bergen-op-ZoomSiege · Europe
- 1771Battle of StołowiczeBattle · Europe
- 1617Peace of BuszaTreaty · Europe
The 19th century
1801 – 1900 · 30 events- 1803Battle of AssayeBattle · South Asia
- 1868Grito de LaresRebellion · Mesoamerica and the Caribbean
- 1862Battle of Wood LakeBattle · North America
- 1868Camilla massacreAttack · North America
- 1890Construction of Rossio railway stationConstruction · Europe
- 1810Founding of Republic of West FloridaFounding · North America
- 1816Founding of Warsaw University of Life SciencesFounding · Europe
- 1861Sacking of OsceolaCrime · North America
- 1845Battle of Sidi-BrahimBattle · North Africa
- 1809Jančić's RevoltRebellion · Europe
The 20th century
1901 – 2000 · 145 events- 1920Turkish–Armenian WarWar · Middle East
- 1940Battle of DakarBattle · Sub-Saharan Africa
- 1942Actions along the MatanikauBattle · Oceania
- 1983Gulf Air Flight 771Attack · Middle East
- 1993Transair Georgia airliner shootdownsAccident · Middle East
- 1999Qantas Flight 1Accident · Southeast Asia
- 1991Founding of ArmeniaFounding · Middle East
- 1973September 1973 Argentine general electionElection · South America
- 1918Battle of HaifaBattle · Middle East
- 19878th Session of the Central Committee of the League of Communists of SerbiaPolitical · Europe
The 21st century
since 2001 · 131 events- 2022Hurricane IanNatural disaster · Mesoamerica and the Caribbean
- 2018Ayushman Bharat YojanaEvent · South Asia
- 2008Kauhajoki school shootingAttack · Europe
- 20222022 annexation referendums in Russian-occupied UkraineElection · Europe
- 20262026 Ethiopian offensiveRebellion · Sub-Saharan Africa
- 2018Hurricane LeslieNatural disaster · Europe
- 2024September 2024 Israeli attacks against LebanonEvent · Middle East
- 2021arrest of Carles Puigdemont in ItalyEvent · Europe
- 2008Typhoon JangmiEvent
- 2026eviction of Maricarmen AbascalEvent · Europe
About the dates
Each event is listed under the date its sources give, as its page shows it. Before 1582, and in some countries later (Britain until 1752, Russia until 1918), that is a date of the Julian calendar, as on Wikipedia’s pages for each day.