Date·Lore

On This Day · The 266th day of the year

September 23

September 23 carries 10 recorded events spanning between 1122 and 2010. Pope Callixtus II and Holy Roman Emperor Henry V agree to the Concordat of Worms to put an end to the Investiture Controversy.

♎ZodiacLibra ◈BirthstoneSapphire ❀Birth flowerAster

Compiled & reviewed by · Last reviewed July 13, 2026

What happened on September 23?

September 23 is the 266th day of the year. It marks 10 notable events in history, dated between 1122 and 2010. Famous people born on September 23 include Bruce Springsteen, Augustus and John Coltrane.

The shape of the day

September 23's record stretches 888 years, from 1122 to 2010. Its center of gravity is the 20th century, and conflict is a recurring thread.

Libra is the sign for September 23 — read more on the Libra page, or see September's birthstone & birth flower.

Released on September 23

Movies, games, albums & shows

2025

  • Game Aethermancer
  • Game Sworn
  • Game Baby Steps
  • Game Slime Rancher 2

2024

  • Game Maiden Cops
  • Game Tiny Glade

2022

  • Game Shovel Knight Dig
  • Game Prodeus
  • TV Golden Boy

2021

  • Game Sable
  • TV Foundation

Release data from TMDB & IGDB.

Events

10 notable moments
  1. 1122

    Pope Callixtus II

    Pope Callixtus II and Holy Roman Emperor Henry V agree to the Concordat of Worms to put an end to the Investiture Controversy.

  2. 1338

    Battle of Arnemuiden

    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 naval battle in which gunpowder artillery is used.

  3. 1642

    First English Civil War

    First English Civil War: The Battle of Powick Bridge, the first engagement between the primary field armies of the Royalists and the Parliamentarians, ends in a Royalist victory.

  4. 1779

    American Revolutionary War

    American Revolutionary War: John Paul Jones, naval commander of the United States, on board the USS Bonhomme Richard, wins the Battle of Flamborough Head.

  5. 1884

    Cape Virgenes

    On the night of 23–24 September, the steamship Arctique runs aground near Cape Virgenes leading to the discovery of nearby placer gold, beginning the Tierra del Fuego gold rush.

  6. 1913

    United Mine Workers of America

    The United Mine Workers of America launch a strike which eventually escalated into the Colorado Coalfield War.

  7. 1920

    1920 Louisiana hurricane

    The Louisiana hurricane dissipates over Kansas after forcing around 4,500 people to evacuate and causing $1.45 million in damages.

  8. 1952

    Richard Nixon

    After being accused of financial improprieties, Senator Richard Nixon delivers his "Checkers speech" nationwide on television and radio, defending his actions and successfully salvaging his nomination as the Republican candidate for Vice President.

  9. 2008

    Kauhajoki school shooting

    Matti Saari kills ten people at a school in Finland before committing suicide.

  10. 2010

    Teresa Lewis

    Teresa Lewis becomes the first woman to be executed by the U.S. state of Virginia since 1912, and the first woman in the state to be executed by lethal injection.

Famous birthday twins

Born on September 23

Bruce Springsteen

b. 1949

American singer-songwriter and guitarist

Augustus

b. -63

Roman emperor (died 14 AD)

John Coltrane

b. 1926

American jazz saxophonist and composer

Asima Chatterjee

b. 1917

Indian chemist

Kublai Khan

b. 1215

Mongolian emperor

Louise Nevelson

b. 1899

American sculptor

Karl Pilkington

b. 1972

English actor and producer

Matt Hardy

b. 1974

American wrestler

Deaths

  • 2018Charles K. Kao
  • 1988Tibor Sekelj
  • 1973Pablo Neruda
  • 1939Sigmund Freud
  • 1917Werner Voss
  • 1728Christian Thomasius

Holidays & observances

  • —Christian feast day: Adomnán
  • —Christian feast day: Cissa of Crowland (or of Northumbria)
  • —Christian feast day: Blessed Francisco de Paula Victor
  • —Christian feast day: Padre Pio
  • —Christian feast day: Pope Linus
  • —Christian feast day: Sossius
  • —Christian feast day: Thecla (Roman Catholic Church)
  • —Christian feast day: Xanthippe and Polyxena

Historical facts, event summaries, and biographical lines above are adapted from Wikipedia under the Creative Commons Attribution-ShareAlike (CC BY-SA) license. DateLore adds curation, structure, and original editorial commentary. DateLore is not affiliated with the Wikimedia Foundation.

About the author

Roman Tailor compiles and reviews every date on DateLore. He's the writer and editor behind the site's editorial essays and the day-by-day almanac. Corrections and questions are welcome — read more about DateLore or get in touch.

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