Wikipedia:Selected anniversaries/April 3

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 * 1559 – Henry II of France and Philip II of Spain signed the second treaty of Cateau-Cambrésis, ending the Italian War of 1551–1559.
 * 1721 – Robert Walpole (pictured) took office as First Lord of the Treasury, Chancellor of the Exchequer and Leader of the House of Commons, becoming the first de facto prime minister of Great Britain.
 * 1860 – The Pony Express, a mail service that became the most direct means of long-distance communication across the United States before the first transcontinental telegraph, began operation.
 * 1888 – Emma Elizabeth Smith was killed in the first of eleven unsolved murders of women that took place in or near the impoverished Whitechapel district in the East End of London.
 * 1895 – The libel trial instigated by Irish author Oscar Wilde (pictured) began, eventually resulting in his arrest, trial and imprisonment on charges of gross indecency.
 * 1933 – Lord Clydesdale and David McIntyre undertook the first successful flight over Mount Everest.
 * 2000 – In United States v. Microsoft Corp., Microsoft was found to have violated antitrust law by bundling the web browser Internet Explorer with its Windows operating system.
 * 2010 – Apple Inc. released the first generation iPad, a tablet computer.
 * 2016 – The first news stories on the Panama Papers were published, revealing that shell corporations represented by the Panamanian law firm Mossack Fonseca had been used for illegal purposes.
 * Born/died: | Al-Adil ibn al-Sallar |d|1154|Richard of Chichester |d|1253| George Herbert |b|1593| Cyrus K. Holliday |b|1826|Ernst Chladni |d|1827|   Talbot Baines Reed |b|1852|Thomas C. Kinkaid |b|1888|  Roza Shanina |b|1924| Tony Benn |b|1925| Pál Teleki |d|1941|SethBling |b|1987| Graham Greene |d|1991| Mary Cartwright |d|1998