På denne dag: 21. mai
Utforsk avgjørende hendelser, vitenskapelige sprang og historiske vendepunkter. Med kildekritisk merking for antikke og kalenderusatte datoer.
878: Historisk hendelse
Arab–Byzantine wars: The city of Syracuse was captured by the Aghlabids (pictured) as part of the Muslim conquest of Sicily.
1138: Historisk hendelse
The Crusades: The siege of Shaizar ended, and the Emir of Shaizar became a vassal of the Byzantine Empire.
1703: Historisk hendelse
English writer Daniel Defoe was imprisoned for seditious libel after publishing a pamphlet that was perceived to satirise the Tory publications about Dissenters.
1851: Historisk hendelse
The Congress of Colombia passed a law abolishing slavery in the country, to take effect at the beginning of the new year.
1856: Historisk hendelse
A crowd of about 800 pro-slavery Americans ransacked the town of Lawrence, Kansas.
1864: Historisk hendelse
American Civil War: The inconclusive Battle of Spotsylvania Court House in Virginia ended with combined Union and Confederate casualties totaling around 31,000.
1911: Historisk hendelse
Mexican president Porfirio Díaz and the revolutionary Francisco I. Madero signed the Treaty of Ciudad Juárez to end hostilities between each other's forces, concluding the initial phase of the Mexican Revolution.
1917: Historisk hendelse
The Imperial War Graves Commission was established by royal charter to mark, record and maintain the graves and places of commemoration of British Empire military forces.
1924: Historisk hendelse
University of Chicago students Nathan Leopold Jr. and Richard Loeb (both pictured) murdered a 14-year-old boy in a thrill killing out of a desire to commit a "perfect crime".
1925: Historisk hendelse
The opera Doktor Faust, unfinished when composer Ferruccio Busoni (pictured) died, was premiered in Dresden.
1927: Historisk hendelse
Aboard the Spirit of St. Louis, American aviator Charles Lindbergh (pictured) completed the first solo non-stop transatlantic flight, flying from Roosevelt Field near New York City to Paris–Le Bourget Airport.
1946: Historisk hendelse
While working with a mass of plutonium known as the demon core, Manhattan Project physicist Louis Slotin accidentally exposed himself to a lethal dose of hard radiation, making him the second victim of a criticality accident in history.
1991: Historisk hendelse
Former Indian prime minister Rajiv Gandhi was assassinated by a suicide bomber in Sriperumbudur, Tamil Nadu.
1998: Historisk hendelse
Indonesian president Suharto resigned after a collapse of support for his presidency amid economic and political crises, ending 32 years in power.
2005: Historisk hendelse
The world's tallest roller coaster, Kingda Ka, opened at Six Flags Great Adventure in Jackson, New Jersey, U.S.
2014: Historisk hendelse
A Taiwanese man carried out a stabbing spree on a Taipei Metro train, killing four people and injuring 24 others.
2015: Historisk hendelse
Islamic State militants entered the ancient city of Palmyra.
2024: Historisk hendelse
The Greenfield tornado, estimated to have produced winds in excess of 309 miles per hour (497 km/h), moved across Iowa.
🔍 Om kildene og historisk datering
Å tidfeste hendelser tusenvis av år tilbake i tid er en krevende historievitenskapelig oppgave. Før innføringen av den julianske kalenderen (45 f.Kr.) og den gregorianske kalenderen (1582) benyttet ulike sivilisasjoner (romere, grekere, kinesere, babylonere) vidt forskjellige kalendersystemer basert på månesykluser eller lokale embetsperioder.
Slik merker vi dateringene:
• ✓ Sikker datering: Dokumentert i samtidige protokoller, offisielle traktater eller etter standardiserte kalendersystemer.
• ⚠️ Usikker / estimert: Hendelsen er historisk reell, men datoen er tradisjonell, basert på senere krøniker eller lunisolare omregninger.
- Wikimedia Foundation – Wikipedia On This Day arkiver og historiske registre.
- Store norske leksikon (SNL) – Norsk og internasjonal historie, biografier og årstallsverifisering.
- Encyclopædia Britannica – Verifisering av antikke slag, fredsavtaler og statsdannelser.
- NASA Historical Logs & Science Missions – Romfartshistoriske datoer og oppskytningstelemetri.