Protesters demanding a new election in Belarus, following the rigged Belarusian presidential election, 2006, clash with riot police. Opposition leader Aleksander Kozulin is among several protesters arrested.
Capitol Hill massacre: A gunman kills six people before taking his own life at a party in Seattle's Capitol Hill neighborhood.
The European Union's Veterinarian Committee bans the export of British beef and its by-products as a result of mad cow disease (Bovine spongiform encephalopathy).
WikiWikiWeb, the world's first wiki, and part of the Portland Pattern Repository, is made public by Ward Cunningham.
The Candle demonstration in Bratislava is the first mass demonstration of the 1980s against the communist regime in Czechoslovakia.
The first fully functional Space Shuttle orbiter, Columbia, is delivered to the John F. Kennedy Space Center to be prepared for its first launch.
Faisal of Saudi Arabia is shot and killed by a mentally ill nephew.
The Army of the Republic of Vietnam abandon an attempt to cut off the Ho Chi Minh trail in Laos.
Bangladesh Liberation War: Beginning of Operation Searchlight by the Pakistan Armed Forces against East Pakistani civilians.
During their honeymoon, John Lennon and Yoko Ono hold their first Bed-In for Peace at the Amsterdam Hilton Hotel (until March 31).
Civil rights activists led by Martin Luther King Jr. successfully complete their 4-day 50-mile march from Selma to the capitol in Montgomery, Alabama.
The European Economic Community is established with West Germany, France, Italy, Belgium, Netherlands and Luxembourg as the first members.
United States Customs seizes copies of Allen Ginsberg's poem "Howl" on obscenity grounds.
More than 92,000 kulaks are suddenly deported from the Baltic states to Siberia.
The first successful tornado forecast predicts that a tornado will strike Tinker Air Force Base, Oklahoma.
An explosion in a coal mine in Centralia, Illinois kills 111.
The Kingdom of Yugoslavia joins the Axis powers with the signing of the Tripartite Pact.
The Scottsboro Boys are arrested in Alabama and charged with rape.
On the anniversary of Greek Independence, Alexandros Papanastasiou proclaims the Second Hellenic Republic.
The Belarusian People's Republic is established.
The Georgian Orthodox Church restores its autocephaly abolished by Imperial Russia in 1811.
In New York City, the Triangle Shirtwaist Factory fire kills 146 garment workers.
Coxey's Army, the first significant American protest march, departs Massillon, Ohio for Washington, D.C.
American Civil War: In Virginia, Confederate forces temporarily capture Fort Stedman from the Union.
Traditional date of the start of the Greek War of Independence. The war had actually begun on 23 February 1821 (Julian calendar).
Percy Bysshe Shelley is expelled from the University of Oxford for publishing the pamphlet The Necessity of Atheism.
The Swansea and Mumbles Railway, then known as the Oystermouth Railway, becomes the first passenger-carrying railway in the world.
The Slave Trade Act becomes law, abolishing the slave trade in the British Empire.
The Treaty of Amiens is signed as a "Definitive Treaty of Peace" between France and the United Kingdom.
Saturn's largest moon, Titan, is discovered by Christiaan Huygens.
Sir Walter Raleigh is granted a patent to colonize Virginia.
Jerome Savage takes out a sub-lease to start the Newington Butts Theatre outside London.
The city of Valencia is founded in present-day Venezuela.
The Council of Pisa opens.
Robert the Bruce becomes King of Scots (Scotland).
Richard I is wounded by a crossbow bolt while fighting France, leading to his death on April 6.
Fatimid caliph al-Hakim bi-Amr Allah assassinates the eunuch chief minister Barjawan and assumes control of the government.
Romanos Lekapenos seizes the Boukoleon Palace in Constantinople and becomes regent of the Byzantine emperor Constantine VII.
Theodosius III resigns the throne to the Byzantine Empire to enter the clergy.
Pope Constantine succeeds Pope Sisinnius as the 88th pope.