April 4

• April 4, 527
  Emperor Justin, seriously ill, crowns his nephew Justinian as his co-emperor
• April 4, 1581
  Frances Drake is made a knight after his attacks on Spanish possessions, which influences Philip II of Spain to build up the Spanish Armada
• April 4, 1655
  English fleet beats Barbarian pirates at Porto Farina near Tunis
• April 4, 1660
  English Charles II issues the Declaration of Breda, in which he promises a general pardon for crimes committed during the English Civil War and the Interregnum for all those who recognize Charles as the lawful king
• April 4, 1721
  Robert Walpole becomes England's first Lord of the Treasury, de facto the first Prime Minister of Great Britain
• April 4, 1828
  Coenraad Johannes van Houten, a Dutch chemist, patents chocolate milk powder
• April 4, 1841
  President William Henry Harrison, 9th President of the US, succumbs to pneumonia one month after his inaugural, becoming the first U.S. chief executive to die in office
• April 4, 1926
  Greek dictator Theodorus Pangalos is elected president
• April 4, 1944
  Charles De Gaulle forms new French regime in exile, with communists
• April 4, 1949
  North Atlantic Treaty Organization pact is signed in Washington D.C. by United States, Britain, France and Canada in purpose to collective defense against Soviet influence
• April 4, 1968
  Martin Luther King Jr, civil rights leader, is assassinated by a sniper's bullet on the motel's second-floor balcony in Memphis, United States, at age 39
• April 4, 1969
  Dr. Denton Cooley implants first temporary artificial heart
• April 4, 1975
  Microsoft, an American multinational corporation, is founded as a partnership between Bill Gates and Paul Allen
• April 4, 1982
  The British Falkland Islands government surrenders after Argentinean invasion, placing the islands in control of Argentina
• April 4, 1992
  Sali Berisha becomes president and Alexander Meksi premier of Albania, ending the dictatorship in Albania
• April 4, 2005
  Tulip Revolution in Kyrgyzstan, triggered by parliamentary elections, overthrows President Askar Akayev as he signs his resignation statement