In History, Today on November 23

Oxford-AstraZeneca announced that its COVID-19 vaccine showed an average efficacy of 70% in large-scale trials in Brazil and the UK. This announcement followed similar releases by Pfizer-BioNTech and Moderna, contributing to global vaccination efforts.

An earthquake of magnitude 6.4 struck western Albania, causing fatalities and widespread damage.

The Camp Fire, the deadliest and most destructive wildfire in California's history, was fully contained after burning for over two weeks.

A Russian Sukhoi Su-24 fighter jet is shot down by a Turkish F-16 fighter jet near the Syria–Turkey border, escalating tensions between the two countries.

The European Space Agency's Mars Express spacecraft discovers a large amount of water ice beneath the surface of Mars.

Alexander Litvinenko, a former Russian spy, dies in London after being poisoned with polonium-210, leading to a major international incident.

Ellen Johnson Sirleaf is declared the winner of the Liberian presidential election, becoming Africa's first elected female head of state.

Georgia's President Eduard Shevardnadze resigns following the Rose Revolution, a peaceful protest movement against electoral fraud.

The Convention on Cybercrime, the first international treaty seeking to address Internet and computer crime by harmonizing national laws, improving investigative techniques, and increasing cooperation among nations, is signed in Budapest, Hungary.

Ethiopian Airlines Flight 961 is hijacked and crashes into the Indian Ocean near the Comoros Islands after running out of fuel, resulting in 125 fatalities out of 175 passengers and crew.

The first smartphone, IBM Simon, is introduced at COMDEX in Las Vegas, Nevada, marking a significant milestone in the evolution of mobile technology.

Freddie Mercury, lead vocalist of Queen, publicly acknowledged he had AIDS, one day before his death.

President Ronald Reagan signed the Executive Order 12333, which extended powers of the United States intelligence services on intelligence collection in foreign nations.

A series of earthquakes, the strongest being a magnitude 6.9, strike southern Italy, particularly affecting the regions of Campania and Basilicata, resulting in nearly 3,000 deaths and widespread destruction.

The People's Republic of China is seated in the United Nations Security Council, replacing the Republic of China (Taiwan), marking a significant shift in international relations during the Cold War.

The BBC broadcasts the first episode of "Doctor Who," a science fiction television series that becomes a significant part of British popular culture.

The jukebox musical 'The Music Man,' directed by Morton DaCosta and written by Meredith Willson, was released as a major motion picture.

French naval bombardment of the Vietnamese city of Haiphong kills thousands, escalating tensions that lead to the First Indochina War.

The first issue of Life magazine is published as a photojournalism magazine, becoming one of the most popular and influential publications in the United States.

Edwin Hubble published evidence that the Andromeda Nebula is a separate galaxy beyond the Milky Way, at a meeting of the American Astronomical Society.

Johan Alfred Ander became the last person to be executed in Sweden.

The Battle of Chattanooga begins during the American Civil War, where Union forces under Major General Ulysses S. Grant launch an offensive against Confederate troops, leading to a significant Union victory.

The Austro-Sardinian War comes to an end with the signing of the Armistice of Vignale, effectively concluding the First Italian War of Independence.

The Iroquois Confederacy signs the Treaty of Fort Stanwix with British colonists.

The 'Gentleman’s Magazine' reports an eruption of Mount Vesuvius, a significant volcanic event in Italy.

John Milton publishes 'Areopagitica', a pamphlet decrying censorship and advocating for the freedom of the press, which becomes a foundational text in the history of free speech.

Pretender Perkin Warbeck, who claimed to be Richard of Shrewsbury, Duke of York, is hanged for treason after attempting to overthrow King Henry VII of England.

The Conquest of Seville by the Christian forces of King Ferdinand III of Castile is completed, marking a significant event in the Reconquista, the centuries-long series of battles by Christian states to recapture territory from the Muslims (Moors) on the Iberian Peninsula.

Charlemagne arrives in Rome at the invitation of Pope Leo III, setting the stage for his coronation as Emperor of the Romans on Christmas Day of the same year.

The Battle of the Yarmouk River begins, a significant conflict between the Byzantine Empire and the Rashidun Caliphate, marking a pivotal moment in the Muslim conquest of the Levant.

The second and final revision of the Codex Justinianus was published. This was part of the Corpus Juris Civilis, a fundamental work in the history of Western law, commissioned by Emperor Justinian I of the Byzantine Empire.