1176 – Hashshashin (Assassins) attempt to kill Saladin near Aleppo.
1377 – Pope Gregory XI publishes five papal bulls denouncing the doctrines of the English theologian John Wycliffe.
1455 – War of the two roses: Battle of St Albans – Richard, Duke of York defeats and captures King Henry VI of England.
1762 – Sweden and Prussia sign the Hamburg Treaty.
1807 – Sufficient evidence is presented before a court to indict US Vice President Aaron Burr for treason.
1819 – The SS Savannah sets sail from the port of Savannah (Georgia) for the voyage that will make her the first steamship to cross the Atlantic Ocean. The ship will arrive in Liverpool on June 20.
1840 – The transportation of British prisoners to the penal colony of New South Wales is officially abolished.
1848 – Slavery is officially abolished in Martinique.
1856 – Clubbing by Charles Sumner. South Carolina MP Preston Smith Brooks seriously injures Senator Charles Sumner in the US Senate lobby, due to a speech in which Sumner attacked the southerners who sympathized with the pro-slavery violence in Kansas (Bleeding Kansas) . Sumner was unable to resume his post for three years while recovering from the attack. Brooks became a hero across the South, while Sumner was hailed as a martyr from the North.
1863 – American Civil War: Siege of Port Hudson – Union forces begin the siege of Confederate-controlled Port Hudson (Louisiana).
1872 – President Ulysses S. Grant converts the 1872 Amnesty Act into law, which restores full civil rights to all (less than about 500) sympathizers of the Confederate States of America.
1906 – The Wright Brothers patent their airplane.
– Five trains collide in Scotland, causing 227 deaths and 246 injured;
– Lassen peak burst with unheard of force; it is the only mountain to blow up over Mount Saint Helena in the United States during the 20th century.
1922 – Francis Scott Fitzgerald publishes the story The Curious Case of Benjamin Button for the first time in Collier’s magazine.
1937 – Construction of Eur 42 begins in Rome, to celebrate the twentieth anniversary of the March on Rome in 1942.
1939 – Germany and Italy sign the Steel Pact.
1942 – Mexico takes part in the Second World War alongside the Allies.
1947 – Cold War: In an attempt to combat the spread of communism, President Harry S. Truman converts a decree into law that will be called the Truman Doctrine. The decree guaranteed $ 400 million in military and economic aid to Turkey and Greece.
1954 – The Nordic Passport Union between Denmark, Faroe Islands, Sweden, Norway, Finland and Iceland is signed.
1960 – An earthquake hits southern Chile. It is the strongest earthquake ever recorded, also known as the Great Chilean Earthquake.
1963 – AC Milan became European champion for the first time in its history, thanks to a 2-1 comeback victory over Benfica. It is also the first Italian team to conquer this title.
– The Innovation department stores in central Brussels (Belgium) are on fire. This is the most devastating fire in the history of Belgium, which will cause 323 dead and missing and 150 wounded;
– Egyptian President Nasser announces the closure of the Straits of Tiran.
1968 – The USS Scorpion nuclear submarine sinks with 99 crew members, 600 km southwest of the Azores.
1969 – The lunar module of Apollo 10 flies at 15,400 m from the surface of the Moon.
1972 – Ceylon adopts a new constitution, changing its name in Sri Lanka and joining the Commonwealth.
1978 – Italy: the law on voluntary termination of pregnancy (law no. 194/78) on abortion is approved.
1980 – Namco releases the influential Pac-Man arcade video game.
1987 – The first edition of the Rugby World Cup kicks off in New Zealand.
– Unification of Yemen
– Microsoft releases Windows 3.0
1996 – In Rome the F.C. Juventus wins its second Champions League game against Ajax.
1998 – In Northern Ireland, Protestants and Catholics approve a peace agreement.
– Sonia Gandhi, winner of the Indian elections with the Congress Party, renounces the post of prime minister in favor of Manmohan Singh, because he is opposed by Hindu extremists as a “foreigner”;
– Felipe, prince of Asturias, marries Letizia Ortiz.
– in Madrid Inter won the Champions League by beating Bayern Munich 2-0. Having also conquered the Italian Cup (on 5 May) and the Scudetto (on 16 May), he becomes the first Italian team to hit the Triplete;
– With the episode of “Laszlo pizzas” there is the first commercial exchange documented through Bitcoin, with the consequent formation of the first historical price of a cryptocurrency.
– European elections of 2014;
– Coup d’etat in Thailand, the 19th attempted in the country after the establishment of the constitutional monarchy in 1932.
In Manchester, UK, a suicide bomber attack during the concert of the American singer Ariana Grande in the Manchester Arena causes 22 victims, about 60 injured and 12 missing, all very young.