On This Day · The 355th day of the year

December 21

December 21 carries 10 recorded events spanning between 1237 and 1995. The city of Ryazan is sacked by the Mongol army of Batu Khan.

Compiled & reviewed by · Last reviewed July 13, 2026

What happened on December 21?

December 21 is the 355th day of the year. It marks 10 notable events in history, dated between 1237 and 1995. Famous people born on December 21 include Kurt Waldheim, Masaccio and Chris Evert.

The shape of the day

December 21's record stretches 758 years, from 1237 to 1995. Its center of gravity is the 20th century, and conflict is a recurring thread.

Sagittarius is the sign for December 21 — read more on the Sagittarius page, or see December's birthstone & birth flower.

Released on December 21

Movies, games, albums & shows

2023

  • Game Paranoia: Happiness is Mandatory

Release data from TMDB & IGDB.

Events

10 notable moments
  1. 1237

    Ryazan

    The city of Ryazan is sacked by the Mongol army of Batu Khan.

  2. 1844

    Rochdale Society of Equitable Pioneers

    The Rochdale Society of Equitable Pioneers commences business at its cooperative in Rochdale, England, starting the Cooperative movement.

  3. 1879

    Nora Helmer

    the fictional character of Nora Helmer is first portrayed by Betty Hennings at a showing of A Doll's House at the Royal Danish Theatre.

  4. 1919

    Anarchism

    American anarchist Emma Goldman is deported to Russia.

  5. 1923

    Nepal

    United Kingdom and Nepal formally sign an agreement of friendship, called the Nepal–Britain Treaty of 1923, which superseded the Treaty of Sugauli signed in 1816.

  6. 1934

    Lieutenant Kijé (Prokofiev)

    Lieutenant Kijé, one of Sergei Prokofiev's best-known works, premiered.

  7. 1941

    World War II

    World War II: A Thai-Japanese Pact of Alliance is signed.

  8. 1988

    Pan Am Flight 103

    A bomb explodes on board Pan Am Flight 103 over Lockerbie, Dumfries and Galloway, Scotland, killing 270. This is to date the deadliest air disaster to occur on British soil.

  9. 1992

    Netherlands

    A Dutch DC-10, flight Martinair MP 495, crashes at Faro Airport, Portugal, killing 56.

  10. 1995

    Bethlehem

    The city of Bethlehem passes from Israeli to Palestinian control.

Famous birthday twins

Born on December 21

Kurt Waldheim

b. 1918

Austrian colonel and politician; 9th President of Austria

Masaccio

b. 1401

Italian painter

Chris Evert

b. 1954

American tennis player and coach

Hu Jintao

b. 1942

Chinese engineer and politician, 5th Paramount leader of China

Florence Griffith Joyner

b. 1959

American sprinter and actress

Rutina Wesley

b. 1978

American actress

Adele Goldstine

b. 1920

American computer programmer

Konstantin Rokossovsky

b. 1896

Marshal of the Soviet Union during World War II

Deaths

  • 1992Stella Adler
  • 1992Albert King
  • 1935Kurt Tucholsky
  • 1597Peter Canisius
  • 1375Giovanni Boccaccio

Holidays & observances

  • Armed Forces Day (Philippines)
  • Christian feast day: O Oriens
  • Christian feast day: Peter Canisius
  • Christian feast day: Thomas the Apostle
  • Christian feast day: December 21 (Eastern Orthodox liturgics)
  • Forefathers' Day (Plymouth, Massachusetts)
  • São Tomé Day (São Tomé and Príncipe)

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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