*In this day of 1506, The Lisbon Massacre begins, in which accused Jews are being slaughtered by Portuguese Catholics.
*In this day of 1539, Treaty of Frankfurt signed.
*In this day of 1839, The Treaty of London establishes Belgium as a kingdom and guarantees its neutrality.
*In this day of 1903, The Kishinev pogrom in Kishinev begins, forcing tens of thousands of Jews to later seek refuge in Palestine and the Western world.
*In this day of 1927, Mae West is sentenced to ten days in jail for obscenity for her play Sex.
*In this day of 1943, Albert Hofmann deliberately doses himself with LSD for the first time, three days after having discovered its effects on April 16.
*In this day of 1971, Sierra Leone becomes a republic, and Siaka Stevens the president.
*In this day of 1971, Launch of Salyut 1, the first space station.
*In this day of 1973, The Portuguese Socialist Party is founded in the German town of Bad Münstereifel.
*In this day of 1975, India's first satellite Aryabhata launched in orbit from Kapustin Yar, Russia.
*In this day of 1984, Advance Australia Fair is proclaimed as Australia's national anthem, and green and gold as the national colours.
*In this day of 1989, A gun turret explodes on the USS Iowa, killing 47 sailors.
*In this day of 1999, The German Bundestag returns to Berlin.
*In this day of 2011, Fidel Castro resigns as First Secretary of the Communist Party of Cuba after holding the title since July 1961.
Source-Wikipedia