On April 11:
491 Flavius Anastasius became Byzantine Emperor, with the name of Anastasius I.
1079 Bishop Stanislaus of Krakow waexecuted by order of Bolesław II of Poland.
1241 Batu Khan defeated Béla IV of Hungary at the Battle of Muhi.
1713 War of the Spanish Succession (Queen Anne’s War): Treaty of Utrecht was signed.
1775 The last execution for witchcraft in Germany took place.
1814 The Treaty of Fontainebleau ended the War of the Sixth Coalition against Napoleon Bonaparte, and forces him to abdicate unconditionally for the first time.
1828 Foundation of Bahia Blanca.
1856 Battle of Rivas: Juan Santamaria burned down the hostel where William Walker’s filibusters were holed up.
1865 President Abraham Lincoln made his last public speech.
1868 The Shogunate was abolished in Japan.
1873 Edward Lawson, Scottish recipient of the Victoria Cross, was born.
1876 The Benevolent and Protective Order of Elks was organised.
1888 The Concertgebouw in Amsterdam was inaugurated.
1899 Spain ceded Puerto Rico to the United States.
1905 Albert Einstein revealsed his Theory of Relativity (special relativity).
1907 Ivor Spencer-Thomas, English farmer and entrepreneur, was born.
1908 Jane Bolin, first African-American woman judge, was born.
1908 Masaru Ibuka, Japanese industrialist (Sony), was born.
1919 Soldiers’ votes over turned initial results of a referendum which had shown a majority of 13,000 favouring prohibition.
1919 The International Labour Organisation was founded.
1921 The Emirate of Transjordan was created.
1945 World War II: American forces liberated the Buchenwald concentration camp.
1951 Korean War: President Harry Truman relieved General Douglas MacArthur of overall command in Korea.
1951 The Stone of Scone, the stone upon which Scottish monarchs were traditionally crowned, was found on the site of the altar of Arbroath Abbey. It had been taken by Scottish nationalist students from its place in Westminster Abbey.
1952 The Battle of Nanri Island took place.
1953 Guy Verhofstadt, former Prime Minister of Belgium, was born.
1957 Britain agreed to Singaporean self-rule.
1960 Jeremy Clarkson, British journalist, was born.
1961 The trial of Adolf Eichmann began in Jerusalem.
1963 Billy Bowden, New Zealand umpire, was born.
1965 The Palm Sunday tornado outbreak of 1965: Fifty-one tornadoes hit in six Midwestern states, killing 256 people.
1968 President Lyndon B. Johnson signed the Civil Rights Act of 1968, prohibiting discrimination in the sale, rental, and financing of housing.
1970 Apollo 13 was launched.
1976 The Apple I was created.
1979 Ugandan dictator Idi Amin was deposed.
1981 A massive riot in Brixton, South London, resulted in almost 300 police injuries and 65 serious civilian injuries.
1986 The FBI Miami shootout between eight Federal Bureau of Investigation agents and two heavily-armed and well-trained gunmen.
1987 The London Agreement was secretly signed between Israeli Foreign Affairs Minister Shimon Peres and King Hussein of Jordan.
1990 Customs officers in Middlesbrough, said they had seized what they believed to be the barrel of a massive gun on a ship bound for Iraq.
1993 450 prisoners rioted at the Southern Ohio Correctional Facility in Lucasville, Ohio, and continued to do so for ten days, citing grievances related to prison conditions, as well as the forced vaccination of Nation of Islam prisoners (for tuberculosis) against their religious beliefs.
2001 The crew of a United States EP-3E aircraft that landed in Hainan, China after a collision with an J-8 fighter was released.
2002 The Ghriba synagogue bombing by Al Qaeda killed 21 in Tunisia.
2002 – An attempted coup d’état in Venezuela against President Hugo Chávez took place.
2006 Iranian President Mahmoud Ahmadinejad announced that Iran had successfully enriched uranium.
2007 2007 Algiers bombings: Two bombings in the Algerian capital of Algiers, killed 33 people and wounded a further 222 others.
Sourced from NZ History Online & Wikipedia.