On this day: April 18

Events on April 18

• 1506 The cornerstone of the current St. Peter's Basilica is laid. Wikipedia
• 1521 Trial of Martin Luther begins its second day during the assembly of the Diet of Worms. He refuses to recant his teachings despite the risk of excommunication. Wikipedia
• 1689 Glorious Revolution: Provincial militia and citizens in Boston revolted, arresting officials of the Dominion of New England. Wikipedia
• 1775 American Revolutionary War: Colonists Paul Revere and William Dawes, later joined by Samuel Prescott, began a midnight ride to warn residents of Lexington and Concord, Massachusetts, about the impending arrival of British troops. Wikipedia
• 1797 War of the First Coalition: The Peace of Leoben is signed by Napoleon Bonaparte and Maximilian, Count of Merveldt, creating an armistice between France and Austria, setting the stage for the Treaty of Campo Formio and ending the War of the First Coalition.[citation needed] Wikipedia
• 1864 American Civil War: African-American Union soldiers were massacred and mutilated during and after the Battle of Poison Spring. Wikipedia
• 1881 The painted ceilings of the Natural History Museum, London, were unveiled when the building opened its doors to the public. Wikipedia
• 1897 The Greco-Turkish War is declared between Greece and the Ottoman Empire. Wikipedia
• 1906 The 7.9 Mwearthquake and fire destroy much of San Francisco, California, killing more than 3,000 people, making one of the worst natural disasters in American history. Wikipedia
• 1909 Joan of Arc is beatified in Rome. Wikipedia
• 1912 The Cunard liner RMS Carpathia brings 705 survivors from the RMS Titanic to New York City. Wikipedia
• 1915 World War I: Hit by ground fire, French aviation pioneer Roland Garros landed his aircraft behind enemy lines and was taken prisoner by German forces. Wikipedia
• 1938 Superman, created by Jerry Siegel and Joe Shuster of DC Comics, made his debut in Action Comics #1, the first true superhero comic book. Wikipedia
• 1942 World War II: The Doolittle Raid on Japan: Tokyo, Yokohama, Kobe and Nagoya are bombed. Wikipedia
• 1945 World War II: Over 1,000 bombers attack the small island of Heligoland, Germany. Wikipedia
• 1946 The final session of the League of Nations concluded in Geneva, with delegates agreeing to transfer much of its assets to the United Nations. Wikipedia
• 1946 The International Court of Justice holds its inaugural meeting in The Hague, Netherlands. Wikipedia
• 1949 The Republic of Ireland Act 1948 came into force, describing Ireland as a republic and ending its membership in the Commonwealth of Nations. Wikipedia
• 1954 Gamal Abdel Nasser seizes power in Egypt. Wikipedia
• 1955 Twenty-nine nations meet at Bandung, Indonesia, for the first Asian-African Conference. Wikipedia
• 1958 Controversial American poet Ezra Pound was released from St. Elizabeths Hospital, a psychiatric hospital in Washington, D.C., in which he had been incarcerated for twelve years. Wikipedia
• 1980 The Republic of Zimbabwe (formerly Rhodesia) comes into being, with Canaan Banana as the country's first President. The Zimbabwean dollar replaces the Rhodesian dollar as the official currency. Wikipedia
• 1996 Operation Grapes of Wrath: Israeli forces shelled Qana, Lebanon, killing at least 100 civilians and injuring more than 110 others at a United Nations compound. Wikipedia
• 2007 A ladle spilled 30 tonnes (33 tons) of molten steel in a factory in Liaoning, China, killing 32 workers. Wikipedia
• 2019 The United States Department of Justice released a redacted version of the Mueller report about the investigation of Russian influence on the U.S. presidential election to Congress and the public. Wikipedia
• 2023 Fox News agreed to pay Dominion Voting Systems a $787 million settlement over defamation claims related to the 2020 U.S. presidential election. Wikipedia

Born on April 18

• 359 Gratian, Roman emperor (died 383) Wikipedia
• 1480 Lucrezia Borgia, daughter of Pope Alexander VI (died 1519) Wikipedia
• 1590 Ahmed I, Ottoman Emperor (died 1617) Wikipedia
• 1772 David Ricardo, British economist and politician (died 1823) Wikipedia
• 1905 George H. Hitchings, American physician and pharmacologist, Nobel Prize laureate (died 1998) Wikipedia
• 1927 Samuel P. Huntington, American political scientist, author, and academic (died 2008) Wikipedia
• 1927 Tadeusz Mazowiecki, Polish journalist and politician, Prime Minister of Poland (died 2013) Wikipedia
• 1941 Michael D. Higgins, Irish sociologist and politician, 9th President of Ireland Wikipedia
• 1942 Jochen Rindt, German-Austrian racing driver (died 1970) Wikipedia
• 1947 James Woods, American actor and producer Wikipedia
• 1947 Jerzy Stuhr, Polish actor, director, and screenwriter (died 2024) Wikipedia
• 1963 Conan O'Brien, American television host, comedian, and writer Wikipedia
• 1970 Saad Hariri, Saudi Arabian-Lebanese businessman and politician, 33rd Prime Minister of Lebanon Wikipedia
• 1971 David Tennant, Scottish actor Wikipedia
• 1973 Haile Gebrselassie, Ethiopian runner Wikipedia
• 1976 Melissa Joan Hart, American actress Wikipedia
• 1979 Kourtney Kardashian, American television personality Wikipedia
• 1984 America Ferrera, American actress Wikipedia
• 1985 Łukasz Fabiański, Polish footballer Wikipedia
• 1988 Vanessa Kirby, English actress Wikipedia
• 1990 Wojciech Szczęsny, Polish footballer Wikipedia
• 1995 Divock Origi, Belgian footballer Wikipedia

Died on April 18

• 1802 Erasmus Darwin, English physician and botanist (born 1731) Wikipedia
• 1873 Justus von Liebig, German chemist and academic (born 1803) Wikipedia
• 1898 Gustave Moreau, French painter and academic (born 1826) Wikipedia
• 1936 Ottorino Respighi, Italian composer and conductor (born 1879) Wikipedia
• 1943 Isoroku Yamamoto, Japanese admiral (born 1884) Wikipedia
• 1945 John Ambrose Fleming, English physicist and engineer, invented the vacuum tube (born 1849) Wikipedia
• 1947 Jozef Tiso, Slovak priest and politician, President of Slovakia (born 1887) Wikipedia
• 1951 Óscar Carmona, Portuguese field marshal and politician, 11th President of Portugal (born 1869) Wikipedia
• 1955 Albert Einstein, German-American physicist, engineer, and academic (born 1879) Wikipedia
• 1958 Maurice Gamelin, Belgian-French general (born 1872) Wikipedia
• 1964 Ben Hecht, American director, producer, and screenwriter (born 1894) Wikipedia
• 1974 Marcel Pagnol, French author, playwright, and director (born 1895) Wikipedia
• 1995 Arturo Frondizi, Argentinian lawyer and politician, 32nd President of Argentina (born 1908) Wikipedia
• 2002 Thor Heyerdahl, Norwegian ethnographer and explorer (born 1914) Wikipedia

Holidays and observances

• Christian feast day: Anthusa of Constantinople Wikipedia
• Christian feast day: Cyril VI of Constantinople (Eastern Orthodox Church) Wikipedia
• Christian feast day: Eleutherius and Antia Wikipedia
• Christian feast day: Galdino della Sala Wikipedia
• Christian feast day: Blessed Marie of the Incarnation Wikipedia
• Christian feast day: Molaise of Leighlin Wikipedia
• Christian feast day: Perfectus Wikipedia
• Christian feast day: Blessed Savina Petrilli Wikipedia
• Christian feast day: April 18 (Eastern Orthodox liturgics) Wikipedia
• Army Day (Iran) Wikipedia
• Coma Patients' Day (Poland) Wikipedia
• Friend's Day (Brazil) Wikipedia
• Independence Day (Zimbabwe) Wikipedia
• International Day For Monuments and Sites Wikipedia
• Invention Day (Japan) Wikipedia
• Victory over the Teutonic Knights in the Battle of the Ice (Russia; Julian Calendar) Wikipedia
• World Amateur Radio Day Wikipedia

Sources

• Wikipedia — “April 18” — events, births, deaths and observances (text under CC BY-SA 4.0) (checked 2026-10-15)
• Wikipedia — “Selected anniversaries/April 18” — the anniversaries editors chose for the date and the article each one is about (checked 2026-10-15)
• Wikidata — in how many language editions each entry's own article exists, used to fill the lists (CC0) (checked 2026-10-15)
• vacanza/holidays (open-source holiday rules, MIT licence) — holiday rules used to build the lists (checked 2026-10-15)

The events, births, deaths and observances above are from the English Wikipedia article “April 18” and the articles it links to (authors and history), retrieved 2026-10-15 through the Wikimedia “On this day” feed. They are licensed under CC BY-SA 4.0; this selection is shared under the same licence. Every anniversary that Wikipedia's editors selected for April 18 stays on the list; the remaining places, up to 26 events, 22 births and 14 deaths, go to the entries whose own article — about the event itself, or else the person or thing it is about — appears in the most language editions (counted from Wikidata); an article about a person or thing, which covers far more than one day, counts half. An entry with no article of its own counts, also at half, by the least covered article it links, and one that links only places counts for nothing. Each list runs by year, and the wording is unchanged apart from removing references to pictures, audio and video.