UK story
Pope Callixtus II and Holy Roman emperor Henry V agreed the Concordat of Worms (pictured), ending the Investiture Controversy.
128 things happened on 23 September, from 63 BC to 2022. UK stories come first, then the rest of the world.
UK history first: stories from England, Scotland, Wales and Northern Ireland.
UK story
Pope Callixtus II and Holy Roman emperor Henry V agreed the Concordat of Worms (pictured), ending the Investiture Controversy.
UK story
The Battle of Arnemuiden, in which a French force defeats the English, is the first naval battle of the Hundred Years' War and the first European naval battle in which gunpowder artillery is used.
UK story
The Battle of Blore Heath, the first major battle of the English Wars of the Roses, is won by the Yorkists.
UK story
First English Civil War: The Battle of Powick Bridge, the first engagement between the primary field armies of the Royalists and the Parliamentarians, ended in a Royalist victory.
UK story
American Revolutionary War: British officer John André was captured by Patriot forces, thereby revealing a plot by Continental Army general Benedict Arnold to hand over West Point, New York.
UK story
Maratha troops were defeated by forces of the British East India Company at the Battle of Assaye, one of the decisive battles of the Second Anglo-Maratha War.
UK story
World War I: British forces capture Haifa, Acre, and Es Salt from the Ottoman Empire.
UK story
Korean War: The Battle of Hill 282 is the first US friendly-fire incident on British military personnel since World War II.
UK story
George VI, king of the United Kingdom, has his left lung removed in an operation after a malignant tumour was found.
UK story
The British travel company Thomas Cook Group ceased operations with immediate effect, leaving around 600,000 tourists stranded around the world.
The Battle of Kherlen is the second significant victory over Ming dynasty China by the Mongols since 1368.
King Philip II of Spain issues cedula, ordering a halt to colonizing efforts in Florida.
The treaty of Saint Petersburg is signed, in which Imperial Russia gains Derbent, Baku, and the coastal areas in between as well as the provinces of Gilan, Mazandaran, and Astrabad from Safavid Persia while the Shah receives Russian soldiers for domestic peacekeeping.
American Revolutionary War: John Paul Jones, naval commander of the United States, on board the USS Bonhomme Richard, wins the Battle of Flamborough Head.
Astronomers Urbain Le Verrier, John Couch Adams and Johann Gottfried Galle collaborate on the discovery of Neptune.
The Grito de Lares occurs in Puerto Rico against Spanish rule.
The Macedo-Romanian Cultural Society is founded.
The French steamship Arctique ran aground on the northern coast of Cape Virgenes in Argentina; gold was discovered during the rescue effort, triggering the Tierra del Fuego Gold Rush.
Ethiopian forces under Ras Alula defeat Mahdist Sudanese forces in the battle of Kufit.
Philippine-American War: the American Asiatic Squadron destroys a Filipino battery at the Battle of Olongapo.
Norway and Sweden sign the Karlstad Treaty, peacefully dissolving the Union between the two countries.
The United Mine Workers of America began a strike against the Rockefeller-owned Colorado Fuel & Iron Company, sparking the Colorado Coalfield War.
The Louisiana hurricane dissipated over Kansas after forcing around 4,500 people to evacuate and causing $1.45 million in damages.
Saudi National Day: Crown Prince (later king) Faisal of Saudi Arabia, on behalf of Ibn Saud, proclaims the unification of the Kingdom of Saudi Arabia, the current iteration of the Third Saudi State.
World War II: The Matanikau action on Guadalcanal begins: U.S. Marines attack Japanese units along the Matanikau River.
U.S. vice-presidential candidate Richard Nixon delivered the Checkers speech, one of the first political uses of television to appeal directly to the populace.
Little Rock schools integration crisis: President Dwight D. Eisenhower sends the 101st Airborne Division to Little Rock, Arkansas, and federalizes the Arkansas National Guard, ordering both to support the integration of Little Rock Central High School.
U.S. President John F. Kennedy nominates African American civil rights lawyer Thurgood Marshall to the Court of Appeals for the Second Circuit, although pro-segregation Southern senators manage to delay his confirmation until September 11, 1962.
Argentine general election: Juan Perón returns to power in Argentina.
Irish rock band U2 performed in Sarajevo (pictured), the first major artist to hold a concert in the city since the end of the Bosnian War.
The first version of the web browser Firefox was released by the Mozilla Organization.
Voting begins in the five-day sham annexation referendums in Russian-occupied Ukraine, leading to Russian annexation of Donetsk, Kherson, Luhansk and Zaporizhzhia oblasts.
Every answer is somewhere on this page. Have a go, then check!
In which year did this happen: “American Revolutionary War: British officer John André was captured by Patriot”?
B: 1780. 1780 — that’s 246 years ago. Find it on the page
In which year did this happen: “Maratha troops were defeated by forces of the British East India Company at”?
C: 1803. 1803 — that’s 223 years ago. Find it on the page
Which of these happened first?
C: Pope Callixtus II and Holy Roman emperor Henry V agreed the Concordat of Worms. 1803: Maratha troops were defeated by forces of the British East India Company at · 1780: American Revolutionary War: British officer John André was captured by Patriot · 1122: Pope Callixtus II and Holy Roman emperor Henry V agreed the Concordat of Worms Find it on the page
“Pope Callixtus II and Holy Roman emperor Henry V agreed the Concordat of Worms” happened in 1122. How many years ago was that?
C: 904 years. 2026 − 1122 = 904. Find it on the page
Famous people whose birthday is 23 September.
Well-known people who died on 23 September.
Festivals, holidays and saints’ days celebrated on 23 September somewhere in the world.
Content note: these entries mention things like war, violence, deaths, disasters or crime. They are part of history, but they can be upsetting. Grown-ups and teachers: you may want to read them first. They come straight from Wikipedia and have not been rewritten for children.
Stories with a heading have been written for young readers by A Day in the Past, using the linked articles as sources. Other entries show text from Wikipedia’s “September 23” page and its “On this day” feed, written by Wikipedia contributors and shared under the Creative Commons Attribution-ShareAlike 4.0 licence. Each “Read more” link goes to the article an entry is based on. Photos are credited under each picture. Spotted a mistake? Please tell us.