På denne dag: 20. mai
Utforsk avgjørende hendelser, vitenskapelige sprang og historiske vendepunkter. Med kildekritisk merking for antikke og kalenderusatte datoer.
325: Historisk hendelse
The First Council of Nicaea, the first ecumenical council of the Christian Church, was formally opened by Constantine the Great.
685: Historisk hendelse
The Picts defeated the Northumbrians at the Battle of Dun Nechtain, severely weakening the latter's power in northern Great Britain.
794: Historisk hendelse
According to the Anglo-Saxon Chronicle, King Æthelberht II of East Anglia was beheaded on the orders of Offa of Mercia.
1217: Historisk hendelse
First Barons' War: English forces under William Marshal defeated French troops at the Battle of Lincoln.
1515: Historisk hendelse
Ulysses, who would be famously depicted in a posthumous woodcut, landed in Lisbon, becoming the first of his species to visit Europe in a thousand years.
1609: Historisk hendelse
Thomas Thorpe published the first copies of Shakespeare's sonnets, possibly without William Shakespeare's consent.
1714: Historisk hendelse
J. S. Bach led the first performance of his Pentecost cantata Erschallet, ihr Lieder at the chapel of Schloss Weimar.
1811: Historisk hendelse
A British squadron under Charles Marsh Schomberg defeated a French force off Tamatave, Madagascar, that was attempting to reinforce the French garrison on Mauritius.
1875: Historisk hendelse
Representatives from seventeen countries signed the Metre Convention, which set up an institute for the purpose of coordinating international metrology and for coordinating the development of the metric system.
1927: Historisk hendelse
With the signing of the Treaty of Jeddah, the United Kingdom recognized the sovereignty of Ibn Saud over Hejaz and Nejd, which later merged to become Saudi Arabia.
1941: Historisk hendelse
World War II: German paratroopers began the Battle of Heraklion on the island of Crete, capturing the airfield and port in Heraklion ten days later.
1943: Historisk hendelse
The Luttra Woman (skull pictured), a bog body from the Early Neolithic period, was discovered near Luttra, Sweden.
1947: Historisk hendelse
The first session of the National Diet opened in Tokyo, Japan.
1965: Historisk hendelse
While attempting to land at Cairo International Airport, Pakistan International Airlines Flight 705 crashed for unknown reasons, killing all but 6 of the 121 people on board.
1983: Historisk hendelse
A team of researchers led by French virologist Luc Montagnier published their discovery of HIV, but were not then certain that it caused AIDS.
1993: Historisk hendelse
"One for the Road", the series finale of American television sitcom Cheers, was watched by 42.4 million American households on its original airing.
1996: Historisk hendelse
In deciding Romer v. Evans, the U.S. Supreme Court struck down a constitutional amendment in Colorado that prevented protected status under the law for homosexuals or bisexuals.
2012: Historisk hendelse
The first of two major earthquakes struck Northern Italy, resulting in seven deaths.
2013: Historisk hendelse
A tornado struck Moore, Oklahoma, United States, killing 24 people and causing an estimated $2 billion of damage.
2022: Historisk hendelse
Russo-Ukrainian war: Russia claimed full control of Mariupol after a nearly three-month siege.
🔍 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.