21st. March
Events

630 - Byzantine emperor Heraclius restores the True Cross to Jerusalem.
717 - Battle of Vincy between Charles Martel and Ragenfrid.
1188 - Accession to the throne of Japan by emperor Antoku.
1413 - Henry V becomes King of England.
1801 - The Battle of Alexandria is fought between British and French forces near the ruins of Nicopolis in Egypt.
1804 - Code Napolion is adopted as French civil law.
1821 - First revolutionary act in Monastery of Agia Lavra, Kalavryta, Greek War of Independence.
1844 - The original date predicted by William Miller for the return of Christ.
1871 - Otto von Bismarck is appointed Chancellor of the German Empire.
1871 - Journalist Henry Morton Stanley begins his trek to find the missionary and explorer David Livingstone.
1918 - World War I: Second Battle of the Somme begins.
1928 - Charles Lindbergh is presented the Medal of Honor for his first trans-Atlantic flight.
1933 - Construction of Dachau, the first Nazi Germany concentration camp, is completed.
1935 - Shah Reza Pahlavi formally asks the international community to call Persia by its native name, Iran, which means 'Land of the Aryans'.
1943 - Massacre of the town of Kalavryta, Greece by German Nazi troops.
1945 - World War II: British troops liberate Mandalay, Burma.
1960 - Apartheid: Massacre in Sharpeville, South Africa: Police open fire on a group of unarmed black South African demonstrators, killing 69 and wounding 180.
1965 - Ranger program: NASA launches Ranger 9 which is the last in a series of unmanned lunar space probes.
1965 - Martin Luther King Jr leads 3,200 people on the start of the third and finally successful civil rights march from Selma to Montgomery, Alabama.
1990 - Namibia becomes independent after 75 years of South African rule.