• 350 - Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering Rome at the head of a group of gladiators.
• 1098 - First Crusade: Antioch falls to the crusaders after an eight-month siege.
• 1140 - French scholar Peter Abelard is found guilty of heresy.
• 1326 - Treaty of Novgorod delineates borders between Russia and Norway in Finnmark.
• 1539 - DeSoto claims Florida for Spain
• 1608 - Samuel de Champlain completes his third voyage to New France at Tadoussac, Quebec.
• 1620 - Construction of the oldest stone church in French North America, Notre-Dame-des-Anges, begins at Quebec City, Quebec, Canada.
• 1621 - The Dutch West India Company receives a charter for New Netherlands.
• 1658 - The Pope appoints François de Laval vicar apostolic in New France.
• 1665 - James Stuart, Duke of York (later to become King James II of England) defeats the Dutch Fleet off the coast of Lowestoft.
• 1770 - Mission San Carlos Borromeo de Carmelo is founded in Carmel-by-the-Sea, California.
• 1800 - U.S. President John Adams takes up residence in Washington, DC (in a tavern – the White House wasn't yet completed).
• 1850 - The traditional founding date of Kansas City, Missouri. This was the date on which it was first incorporated by Jackson County, Missouri as the "City of Kansas".
• 1864 - American Civil War: Battle of Cold Harbor - Union forces attack Confederate troops in Hanover County, Virginia.
• 1866 - Fenians are driven out of Fort Erie, Ontario, into the United States to a heroes' welcome.
• 1885 - Last military engagement fought on Canadian soil: Cree leader Big Bear escapes the North West Mounted Police.
• 1888 - The poem "Casey at the Bat", by Ernest Lawrence Thayer, is published in the San Francisco Examiner.
• 1889 - The Canadian Pacific Railway is completed from coast to coast.
• 1889 - The first long-distance electric power transmission line in the United States is completed, running 14 miles between a generator at Willamette Falls and downtown Portland, Oregon, United States.
• 1907 - Centro Escolar University was established by Librada Avelino and Carmen de Luna in Manila, Philippines.
• 1916 - The ROTC is established by the U.S. Congress.
• 1916 - The National Defense Act is signed into law, increasing the size of the United States National Guard by 450,000 men.
• 1919 - Republic of Prekmurje end.
• 1935 - One thousand unemployed Canadian workers board freight cars in Vancouver, British Columbia, beginning a protest trek to Ottawa, Ontario.
• 1937 - The Duke of Windsor marries Wallis Simpson.
• 1940 - World War II: The Luftwaffe bombs Paris.
• 1940 - World War II: The Battle of Dunkirk ends with a German victory and with Allied forces in full retreat.
• 1943 - A mob of 60 from the Los Angeles Naval Reserve Armory beats up everyone perceived to be Hispanic, starting the week-long Zoot Suit Riots.
• 1956 - British Rail renames 'Third Class' passenger facilities as 'Second Class' (Second Class facilities had been abolished in 1875, leaving just First Class and Third Class).
• 1962 - An Air France Boeing 707 charter, Chateau de Sully crashed after aborted takeoff from Paris, killing 130. The largest single plane accident to date.
• 1963 - A Northwest Airlines DC-7 crashes in the Pacific Ocean off the coast of British Columbia, killing 101.
• 1965 - Launch of Gemini 4, the first multi-day space mission by a NASA crew.
• 1965 - For 21 minutes, Edward H. White floats free outside the space vehicle Gemini IV for the first time.
• 1968 - Valerie Solanas, author of The SCUM Manifesto, attempts to assassinate Andy Warhol by shooting him three times.
• 1969 - Melbourne-Evans collision - Off the coast of South Vietnam, the Australian aircraft carrier HMAS Melbourne cuts the U.S. Navy destroyer USS Frank E. Evans in half.
• 1973 - A Soviet supersonic Tupolev Tu-144 crashes near Goussainville, France, killing 14, the first crash of a supersonic passenger aircraft.
• 1979 - A blowout at the Ixtoc I oil well in the southern Gulf of Mexico causes at least 600,000 tons (176,400,000 gallons) of oil to be spilled into the waters, the worst oil spill to date.
• 1982 - The Israeli ambassador to the United Kingdom, Shlomo Argov, is shot on a London street. He survives but is permanently paralysed.
• 1984 - The Indian Army storms the Golden Temple (Harmandir Sahib), the most sacred shrine of Sikhism, near Amritsar.
• 1989 - The government of China sends troops to force protesters out of Tiananmen Square after seven weeks of occupation.
• 1991 - Mount Unzen erupts in Japan in Kyūshū killing 43 people, all of them either researchers or journalists.
• 1998 - Eschede train disaster: an ICE high speed train derails in Lower Saxony, Germany, causing 101 deaths.
• 2006 - The union of Serbia and Montenegro comes to an end with Montenegro's formal declaration of independence.

Births