Events
1256 – The Augustinian monastic order is constituted at the Lecceto Monastery when Pope Alexander IV issues a papal bull Licet ecclesiae catholicae.
1415 – Religious reformers John Wycliffe and Jan Hus are condemned as heretics at the Council of Constance.
1436 – Assassination of the Swedish rebel (later national hero) Engelbrekt Engelbrektsson
1471 – Wars of the Roses: The Battle of Tewkesbury: Edward IV defeats a Lancastrian Army and kills Edward, Prince of Wales.
1493 – Pope Alexander VI divides the New World between Spain and Portugal along the Line of Demarcation.
1626 – Dutch explorer Peter Minuit arrives in New Netherland (present day Manhattan Island) aboard the See Meeuw.
1675 – King Charles II of England orders the construction of the Royal Greenwich Observatory.
1686 – The Municipality of Ilagan is founded in the Philippines.
1776 – Rhode Island becomes the first American colony to renounce allegiance to King George III.
1799 – Fourth Anglo-Mysore War: The Battle of Seringapatam: The siege of Seringapatam ends when the city is invaded and Tipu Sultan killed by the besieging British army, under the command of General George Harris.
1814 – Emperor Napoleon I of France arrives at Portoferraio on the island of Elba to begin his exile.
1814 – King Ferdinand VII of Spain signs the Decrete of the 4th of May, returning Spain to absolutism.
1836 – Formation of Ancient Order of Hibernians
1855 – American adventurer William Walker departs from San Francisco with about 60 men to conquer Nicaragua.
1859 – The Cornwall Railway opens across the Royal Albert Bridge linking the counties of Devon and Cornwall in England.
1863 – American Civil War: The Battle of Chancellorsville ends with a Union retreat.
1869 – The Naval Battle of Hakodate Bay is fought in Japan.
1871 – The National Association, the first professional baseball league, opens its first season in Fort Wayne, Indiana.
1886 – Haymarket Square Riot: A bomb is thrown at policemen trying to break up a labor rally in Chicago, Illinois, United States, killing eight and wounding 60. The police fire into the crowd.
1904 – The United States begins construction of the Panama Canal.
1904 – Charles Stewart Rolls meets Frederick Henry Royce at the Midland Hotel in Manchester, England.
1910 – The Royal Canadian Navy is created.
1912 – Italy occupies the Greek island of Rhodes.
1919 – May Fourth Movement: Student demonstrations take place in Tiananmen Square in Beijing, China, protesting the Treaty of Versailles, which transferred Chinese territory to Japan.
1932 – In Atlanta, Georgia, mobster Al Capone begins serving an eleven-year prison sentence for tax evasion.
1942 – World War II: The Battle of the Coral Sea begins with an attack by aircraft from the United States aircraft carrier USS Yorktown on Japanese naval forces at Tulagi Island in the Solomon Islands. The Japanese forces had invaded Tulagi the day before.
1945 – World War II: Neuengamme concentration camp near Hamburg is liberated by the British Army.
1945 – World War II: The North German Army surrenders to Field Marshal Bernard Montgomery.
1946 – In San Francisco Bay, U.S. Marines from the nearby Treasure Island Naval Base stop a two-day riot at Alcatraz federal prison. Five people are killed in the riot.
1949 – The entire Torino football team (except for two players who did not take the trip: Sauro Tomà, due to an injury and Renato Gandolfi, because of coach request) is killed in a plane crash at the Superga hill at the edge of Turin, Italy.
1953 – Ernest Hemingway wins the Pulitzer Prize for The Old Man and the Sea.
1959 – The 1st Grammy Awards are held.
1961 – American civil rights movement: The "Freedom Riders" begin a bus trip through the South.
1970 – Vietnam War: Kent State shootings: the Ohio National Guard, sent to Kent State University after disturbances in the city of Kent the weekend before, opens fire killing four unarmed students and wounding nine others. The students were protesting the United States' invasion of Cambodia.
1972 – The Don't Make A Wave Committee, a fledgling environmental organization founded in Canada in 1971, officially changes its name to "Greenpeace Foundation".
1974 – An all-female Japanese team reaches the summit of Manaslu, becoming the first women to climb an 8,000-meter peak.
1979 – Margaret Thatcher becomes the first female Prime Minister of the United Kingdom.
1982 – Twenty sailors are killed when the British Type 42 destroyer HMS Sheffield is hit by an Argentinian Exocet missile during the Falklands War.
1988 – The PEPCON disaster rocks Henderson, Nevada, as tons of space shuttle fuel detonate during a fire.
1989 – Iran-Contra Affair: Former White House aide Oliver North is convicted of three crimes and acquitted of nine other charges. The convictions, however, are later overturned on appeal.
1990 – Latvia proclaims the renewal of its independence after the Soviet occupation.
1994 – Israeli Prime Minister Yitzhak Rabin and PLO leader Yasser Arafat sign a peace accord regarding Palestinian autonomy granting self-rule in the Gaza Strip and Jericho.
1998 – A federal judge in Sacramento, California, gives "Unabomber" Theodore Kaczynski four life sentences plus 30 years after Kaczynski accepts a plea agreement sparing him from the death penalty.
2000 – Ken Livingstone becomes the first Mayor of London.
2001 – The Milwaukee Art Museum addition, the first Santiago Calatrava-designed structure in the United States, opens to the public.
2002 – An EAS Airlines BAC 1-11-500 crashes in a suburb of Kano, Nigeria shortly after takeoff killing more than 148 people.
2007 – Greensburg, Kansas is almost completely destroyed by a 1.7 mi wide EF-5 tornado.

Holidays and observances

Bird Day (United States)
Cassinga Day (Namibia)
Deep Day (Eritrea)
Christian Feast Day:
Blessed Ceferino Giménez Malla
Florian
Gotthard of Hildesheim
Judas Cyriacus
Monica of Hippo
Sacerdos of Limoges
Venerius of Milan
May 4 (Eastern Orthodox liturgics)
Day of the adoption of the Declaration of independence (Latvia)
Death of Milan Rastislav Štefánik Day (Slovakia)
Greenery Day (Japan)
International Firefighters' Day
May Fourth Movement commemorations:
Literary Day (Republic of China)
Youth Day (People's Republic of China)
Remembrance Day for Martyrs and Disabled (Afghanistan)
Remembrance of the Dead (Netherlands)
Star Wars Day
Youth Day (Fiji)

For details, contact Datacentre