UN Day
International Tea Day
World Day for Cultural Diversity for Dialogue and Development

Events of the day
293 – Roman Emperors Diocletian and Maximian appoint Galerius as Caesar to Diocletian, beginning the period of four rulers known as the Tetrarchy.
878 – Syracuse, Italy, is captured by the Muslim sultan of Sicily.
879 – Pope John VIII gives blessings to Branimir of Croatia and to the Croatian people, considered to be international recognition of the Croatian state.
996 – Sixteen-year-old Otto III is crowned Holy Roman Emperor.
1349 – Dušan's Code, the constitution of the Serbian Empire, is enacted by Dušan the Mighty.
1502 – The island of Saint Helena is discovered by the Portuguese explorer João da Nova.
1554 – Queen Mary I grants a royal Charter to Derby School, as a grammar school for boys in Derby, England.
1674 – The nobility elect John Sobieski King of Poland and Grand Duke of Lithuania.
1725 – The Order of St. Alexander Nevsky is instituted in Russia by Empress Catherine I. It would later be discontinued and then reinstated by the Soviet government in 1942 as the Order of Alexander Nevsky.
1758 – Ten-year-old Mary Campbell is abducted in Pennsylvania by Lenape during the French and Indian War. She is returned some six and a half years later.
1809 – The first day of the Battle of Aspern-Essling between the Austrian army led by Archduke Charles and the French army led by Napoleon I of France sees the French attack across the Danube held.
1851 – Slavery is abolished in Colombia, South America.
1856 – Lawrence, Kansas is captured and burned by pro-slavery forces.
1863 – American Civil War: The Union Army succeeds in closing off the last escape route from Port Hudson, Louisiana, in preparation for the coming siege.
1863 – Organization of the Seventh-day Adventist Church in Battle Creek, Michigan.
1864 – Russia declares an end to the Russian-Circassian War and many Circassians are forced into exile. The day is designated the Circassian Day of Mourning.
1871 – French troops invade the Paris Commune and engage its residents in street fighting. By the close of "Bloody Week", some 20,000 communards have been killed and 38,000 arrested.
1871 – Opening of the first rack railway in Europe, the Rigi-Bahnen on Mount Rigi.
1879 – War of the Pacific: Two Chilean ships blocking the harbor of Iquique (then belonging to Peru) battle two Peruvian vessels in the Battle of Iquique.
1881 – The American Red Cross is established by Clara Barton in Washington, D.C..
1894 – The Manchester Ship Canal in England is officially opened by Queen Victoria, who later knights its designer Sir Edward Leader Williams.
1904 – The Fédération Internationale de Football Association (FIFA) is founded in Paris.
1911 – Mexican President Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, and thus concluding the initial phase of the Mexican Revolution.
1917 – The Commonwealth War Graves Commission is established through Royal Charter to mark, record and maintain the graves and places of commemoration of Commonwealth of Nations military forces.
1917 – The Great Atlanta fire of 1917 causes $5.5 million in damages, destroying some 300 acres including 2,000 homes, businesses and churches, displacing about 10,000 people and leading to only fatality (due to heart attack).
1924 – University of Chicago students Richard Loeb and Nathan Leopold, Jr. murder 14-year-old Bobby Franks in a "thrill killing".
1927 – Charles Lindbergh touches down at Le Bourget Field in Paris, completing the world's first solo nonstop flight across the Atlantic Ocean.
1932 – Bad weather forces Amelia Earhart to land in a pasture in Derry, Northern Ireland, and she thereby becomes the first woman to fly solo across the Atlantic Ocean.
1934 – Oskaloosa, Iowa, becomes the first municipality in the United States to fingerprint all of its citizens.
1936 – Sada Abe is arrested after wandering the streets of Tokyo for days with her dead lover's severed genitals in her hand. Her story soon becomes one of Japan's most notorious scandals.
1937 – A Soviet station, North Pole-1, becomes the first scientific research settlement to operate on the drift ice of the Arctic Ocean.
1939 – The Canadian National War Memorial is unveiled by King George VI and Queen Elizabeth in Ottawa.
1946 – Physicist Louis Slotin is fatally irradiated in a criticality incident during an experiment with the Demon core at Los Alamos National Laboratory.
1951 – The opening of the Ninth Street Show, otherwise known as the 9th Street Art Exhibition – a gathering of a number of notable artists, and the stepping-out of the post war New York avant-garde, collectively known as the New York School.
1961 – American civil rights movement: Alabama Governor John Malcolm Patterson declares martial law in an attempt to restore order after race riots break out.
1966 – The Ulster Volunteer Force declares war on the Irish Republican Army in Northern Ireland.
1969 – Civil unrest in Rosario, Argentina, known as Rosariazo, following the death of a 15-year-old student.
1972 – Michelangelo's Pietà in St. Peter's Basilica in Rome is damaged by a vandal, the mentally disturbed Hungarian geologist Laszlo Toth.
1976 – The Yuba City bus disaster occurs in Martinez, California. 29 are killed making it the deadliest road accident in U.S. history.
1979 – White Night riots in San Francisco following the manslaughter conviction of Dan White for the assassinations of George Moscone and Harvey Milk.
1981 – Irish Republican hunger strikers Raymond McCreesh and Patsy O'Hara die on hunger strike in Maze prison.
1981 – The Italian government releases the membership list of Propaganda Due, an illegal pseudo-Masonic lodge that was implicated in numerous Italian crimes and mysteries.
1982 – Falklands War: A British amphibious assault during Operation Sutton leads to the Battle of San Carlos.
1990 – The Democratic Republic of Yemen and North Yemen agree to merge into the Republic of Yemen.
1991 – Former Indian Prime Minister Rajiv Gandhi is assassinated by a female suicide bomber near Madras.
1991 – Mengistu Haile Mariam, president of the People's Democratic Republic of Ethiopia, flees Ethiopia, effectively bringing the Ethiopian Civil War to an end.
1994 – The Democratic Republic of Yemen unsuccessful attempts to secede from the Republic of Yemen; a war breaks out.
1996 – The ferry MV Bukoba sinks in Tanzanian waters on Lake Victoria, killing nearly 1,000.
1996 – The Trappist Martyrs of Atlas, kidnapped during the Algerian Civil War and held for two months, are found dead.
1998 – In Miami, Florida, five abortion clinics are hit by a butyric acid attacker.
2001 – French Taubira law is enacted, officially recognizing the Atlantic slave trade and slavery as crimes against humanity.
2003 – An earthquake hits northern Algeria killing more than 2,000 people.
2005 – The tallest roller coaster in the world, Kingda Ka opens at Six Flags Great Adventure in Jackson Township, New Jersey.
2006 – The Republic of Montenegro holds a referendum proposing independence from the State Union of Serbia and Montenegro. The Montenegrin people choose independence with a majority of 55%.
2010 – JAXA, the Japan Aerospace Exploration Agency, launches the solar-sail spacecraft IKAROS aboard an H-IIA rocket. The vessel would make a Venus flyby late in the year.
2012 – In Qafa e Vishës bus tragedy near Himara, Albania 13 students of Aleksandër Xhuvani University killed in bus crash.

Holidays and observances

Afro-Colombian Day (Colombia)
Christian Feast Day:
Charles-Joseph-Eugene de Mazenod
Emperor Constantine I
Earliest day on which Corpus Christi can fall, while June 24 is the latest; held on Thursday after Trinity Sunday. (Roman Catholic Church)
Helena of Constantinople, also known as "Feast of the Holy Great Sovereigns Constantine and Helen, Equal-to-the-Apostles." (Eastern Orthodox Church)
May 21 (Eastern Orthodox liturgics)
Circassian Day of Mourning (Circassians)
Day of Patriots and Military (Hungary)
Independence Day, honors the 2006 plebiscite that indicated that 55.5% of Montenegrins were in favor of becoming a sovereign nation. (Montenegro)
Navy Day (Chile)
Saint Helena Day, celebrates the discovery of Saint Helena in 1502.
World Day for Cultural Diversity for Dialogue and Development (International)
One of the festivals of Vejovis (Roman Empire)

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