Wikipedia:Selected anniversaries/April 14

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 * 966 – Polish ruler Mieszko I converted to Christianity, an event considered to be the founding of the Polish state.
 * 1471 – Wars of the Roses: The Yorkists under Edward IV defeated the Lancastrians at the Battle of Barnet, killing Richard Neville, Earl of Warwick.
 * 1865 – Actor and Confederate sympathizer John Wilkes Booth fatally shot U.S. president Abraham Lincoln at Ford's Theatre in Washington, D.C.
 * 1906 – The Azusa Street Revival, the primary catalyst for the spread of Pentecostalism in the 20th century, opened in Los Angeles.
 * 1908 – The first Hauser Dam in the U.S. state of Montana failed, causing severe flooding and damage downstream.
 * 1909 – Following a reactionary military revolt against the Committee of Union and Progress, a mob began a massacre of Armenian Christians in the Adana Vilayet of the Ottoman Empire.
 * 1935 – Dust Bowl: A severe dust storm swept across Oklahoma and northern Texas, removing an estimated 300 million tons of topsoil from the prairies.
 * 1945 – World War II: The German town of Friesoythe was razed by the 4th Canadian Division on the orders of Major General Christopher Vokes.
 * 1967 – After leading a military coup three months earlier, Gnassingbé Eyadéma installed himself as President of Togo, a post that he held until 2005.
 * 1978 – Thousands of Georgians demonstrated in Tbilisi against an attempt by the Supreme Soviet of the Georgian SSR to change the constitutional status of the Georgian language.
 * 1999 – A storm dropped around 500,000 tonnes of hailstones on Sydney (examples pictured) and the east coast of New South Wales, causing about A$2.3 billion in damages, the costliest natural disaster in Australian insurance history.
 * 2010 – Nearly 2,700 people were killed in an earthquake registering 6.9 Mw in Yushu Tibetan Autonomous Prefecture, China.
 * 2014 – Boko Haram militants kidnapped 276 schoolgirls from a government secondary school in the town of Chibok, Nigeria.
 * Born/died this day: | Lucia Visconti |d|1424| Christiaan Huygens |b|1629| William Whitehead |d|1785| Harriett Ellen Grannis Arey |b|1819| Alexander Greenlaw Hamilton |b|1852| Princess Beatrice of the United Kingdom |b|1857| V. Gordon Childe |b|1892| L. L. Zamenhof |d|1917| Rod Steiger |b|1925| Berry Berenson |b|1948| Rachel Carson |d|1964| Lita |b|1975| Sarah Michelle Gellar |b|1977