Wikipedia:Selected anniversaries/July 21

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 * 230 – Pope Pontian began his pontificate, succeeding Urban I.
 * 365 – A large earthquake occurred near Crete, triggering a tsunami, and causing widespread destruction around the eastern Mediterranean region.
 * 905 – Louis III, Holy Roman Emperor, was captured and blinded during his attempt to restore Carolingian power over Italy by King Berengar I.
 * 1877 – Much of central Pittsburgh, Pennsylvania, was burned and looted during the Great Railroad Strike of 1877.
 * 1918 – World War I: An Imperial German Navy U-boat opened fire on a small convoy of barges and defending aircraft near the American town of Orleans, Massachusetts.
 * 1925 – American high school biology teacher John T. Scopes was found guilty of violating Tennessee's Butler Act by teaching evolution in class.
 * 1952 – An earthquake registering 7.3 Mw struck the southern San Joaquin Valley in California, causing 12 deaths and an estimated $60 million in property damage.
 * 1960 – Sirimavo Bandaranaike (pictured) was elected the prime minister of Ceylon, becoming the world's first democratically elected female head of government.
 * 1972 – The Troubles: The Provisional Irish Republican Army detonated twenty-two bombs throughout Belfast, Northern Ireland.
 * 1990 – The Taiwanese military ordered the deportation of dozens of illegal immigrants from mainland China in sealed boat holds, causing 25 deaths due to suffocation.
 * 2007 – Harry Potter and the Deathly Hallows, the final book in the popular Harry Potter series by J. K. Rowling, was released and sold 15 million copies in its first 24 hours, making it the fastest-selling book in history.
 * 2013 – Nour Ahmad Nikbakht, an Iranian diplomat in Yemen, was kidnapped by al-Qaeda militants and held hostage for the next two years.
 * 2019 – People returning from anti-extradition bill protests were attacked (pictured) by suspected triad members in Yuen Long, Hong Kong, leaving 45 people injured.
 * Born/died: | Geoffrey I, Count of Anjou|d|987| Henry Percy|d|1403| Charles Tristan, marquis de Montholon|b|1783|Simion Bărnuțiu|b|1808| Paul Reuter|b|1816| Sophie Aberle|b|1896| Hart Crane|b|1899| Russell Lee|b|1903| Fiammetta Wilson|d|1920| Philomena Franz|b|1922| Johnny Peirson|b|1925| Louis Vauxcelles|d|1943| John Atta Mills|b|1944| Claus von Stauffenberg|d|1944| Hirini Melbourne|b|1949| Jimmie Foxx|d|1967| Ruth St. Denis|d|1968| Anthony Annan|b|1986| Rilwanu Lukman |d|2014|