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18 Mǣdmōnaþ is se 199a dæg þæs gēares in þǣre Gregoriscan gerīmbēc (se 200a in bissextum). Þǣr sind 166 belīfendra daga.

Belimpas 
 390 BC - Beadu Allian: A Roman army is defeated by raiding Gauls, leading to the subsequent sacking of Rome.
 AD 64 - Grēat Rōmisc Fyr: A fire begins to burn in the merchant area of Rōme and soon burns completely out of control while Emperor Nero reportedly plays his lyre and sings while watching the blaze from a safe distance.  
 1830 - Uruquaria gewȳscaþ his forme grundgesetnes.
 1863 - Americanisc Ingefeoht: The first formal African American military unit, the 54th Massachusetts Volunteer Infantry, unsuccessfully assaults Confederate-held Fort Wagner but their valiant fighting still proves the worth of African American soldiers during the war. 
 1873 - Osgar II Swēolandes and Norþweges Cyning is swa Norrena cyning gehalgod on Trondheim
 1898 - Marie Curie and Pierre Curie announced the discovery of a new element and proposed to call it polonium.
 1914 - The United States Army's Signal Corps is formed, giving definite status to its air service for the first time. 
 1925 - Adolf Hitler publishes his personal manifesto Mein Kampf. 
 1942 - Ōðru Woruldgūþ: Þā Þēodiscas test fly the Messerschmitt Me-262 using only its jets for the first time.  
 1944 - Ōðru Woruldgūþ: Hideki Tojo resigns as Forma Þegn of Iapane due to numerous setbacks in the war effort.  
 1947 - Foresittend Harry S. Truman signs the Presidential Succession Act into law which places the Speaker of the House and the Senate President Pro Tempore next in the line of succession after the United States Vice President.  
 1968 - Fietnamesgūþ: The two-day Honolulu Conference begins in Honolulu, Hawaii between US President Lyndon B. Johnson and South Vietnamese foresittend Nguyen Van Thieu. 
  1968   - Intel incorporated.
 1969 - After a party on Chappaquiddick Island, Senator Ted Kennedy from Massachusetts drives an Oldsmobile off a wooden bridge into a tide-swept pond and his passenger, Mary Jo Kopechne, dies.  
  1969   - Apollo 11 makes preparations for landing on the Moon.
 1976 - Gymnast Nadia Comaneci, aged 14, scores first ever perfect 10 at the Olympics.
 1982 - Plan de Sānchez massacre in Rīos Montt's Guatemala. 
 1984 -  In San Ysidro, California, 41-year-old James Oliver Huberty sprays a McDonald's restaurant with gun-fire killing 21 people before being shot dead by police.
 1986 - A tornado is broadcast live on KARE television in Minnesota when the station's helicopter pilot makes a chance encounter.
  1986   - Aliens opens in theaters.
 1994 - In Buenos Aires, an explosion destroys a building housing several Jewish organizations killing 96 and injuring many more. 
 1995 - On the Caribbean island of Montserrat, the Soufriere Hills volcano erupts. Over the course of several years, it devastates the island, destroying the capital and forcing most of the population to flee.
 1996 - Storms provoke severe flooding on the Saguenay Ēa on Quebece, beginning one of Canada's costliest natural disasters ever. 
  1996   - In an event very similar to the Oklahoma tornado that would occur 3 years later, a tornado ranking as a F5 hit the town of Oakfield, Wisconsin.
 2001 - In Baltimore, Marianland, a 60-car train derailment occurs in a tunnel sparking a fire that will last days and virtually shut down downtown Baltimore.

Byrda 
 1552 - Rudolf II, Hālig Romanisc Cāsere
 1635 - Robert Hooke, scientist (d. 1703)
 1811 - William Makepeace Thackeray, author (d. 1863)
 1821 - Pauline Garcia-Viardot, singer/composer (d. 1910)
 1853 - Hendrik Lorentz, Niðerlandisc physicist and Nobel laureate (d. 1928)
 1863 - Franz Ferdinand, Archduke of Austria (d. 1914)
 1864 - Ricarda Huch, wrītere (d. 1947)
  1864   - Phillip Snowden, Britisc politician (d. 1937)
 1887 - Vidkun Quisling, Norþwegisc politician and famous traitor (d. 1945)
 1890 - Frank Forde, fifteenth Forma Minister Australian (d. 1983)

20a gēarhundred 
 1902 - Nathalie Sarraute, wrītere (d. 1999)
  1902   - Jessamyn West, wrītere (d. 1984)
  1902   - Chill Wills, actor (d. 1978)
 1906 - Clifford Odets, author, playwright (d. 1963)
  1906   - S. I. Hayakawa, semanticist and politician (d. 1992)
 1909 - Andrei Gromyko, Soviet diplomat and President 1985-1989 (d. 1989)
  1909   - Mohammed Daoud Khan, Afghani President (1973-1978) (d. 1978)
 1911 - Hume Cronyn, actor (d. 2003)
 1913 - Red Skelton, actor, comedian (d. 1997)
 1918 - Nelson Mandela, Sūþafrican revolutionary and foresittend (d. 2013)
 1921 - John Glenn, American astronaut and politician
 1922 - Thomas Kuhn, philosopher (d. 1996)
 1925 - Shirley Strickland, Australian athlete
 1927 - Ludwig Harig, writer
  1927   - Kurt Masur, Silesian-born conductor
 1929 - Dick Button, Olympic gold medal figure skater
  1929   - Screamin' Jay Hawkins (d. 2000)
 1933 - Yevgeny Yevtushenko, poet
 1935 - Jayendra Saraswathi, Hindu religious leader
 1937 - Roald Hoffman, Nobel prize-winning theoretical chemist
  1937   - Hunter S. Thompson, journalist and author
 1940 - James Brolin, actor
  1940   - Joe Torre, baseball player, manager, New York Yankees
 1941 - Martha Reeves, singer
 1947 - Steve Forbes, entrepreneur, politician
 1950 - Sir Richard Branson, entrepreneur
 1963 - Martīn Torrijos Espino, Panamanian president-elect
 1963 - Mike Greenwell, baseball player
 1967 - Vin Diesel, American actor, writer, and director
 1975 - Torii Hunter, baseball player
  1975   - Daron Malakian, guitarist for System of a Down
 1978 - Ben Sheets, baseball player

Dēaðas 
 1374 - Petrarch, Italian Humanist
 1623 - Pāpa Gregory XV
 1721 - Antoine Watteau, Frencisc painter
 1792 - John Paul Jones, American naval commander
 1817 - Jane Austen, novelist
 1949 - Vitezslav Novāk, composer
 1988 - Nico (Christa Paffgen), Þēodisc and American model and sangere
 1990 - Yoon Boseon, Foresittend Sūþcorean
 2001 - Fabio Taglioni, automotive engineer
 2003 - Jane Barbe, stefn of the telephone operator recording in þǣm Geānlǣhtan Underrīcum
 2004 - Paul Foot, radical British investigative journalist

Symbeldagas and observances 
 Uruguay - Constitution Day

17 Mǣdmōnaþ - 19 Mǣdmōnaþ - 18 Sēremōnaþ - 18 Wēodmōnaþ - Getalu ealra daga

18