Wikipedia:Selected anniversaries/April 15

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 * 769 – The final session of the Lateran Council, convened to rectify abuses in the papal electoral process that had led to the elevation of the antipopes Constantine II and Philip, was held in Rome.
 * 1071 – Byzantine–Norman wars: After a siege of almost three years, Italo-Norman forces conquered the city of Bari, the capital of the Catepanate of Italy, ending more than five centuries of Byzantine presence in the region.
 * 1738 – Serse, an opera by Baroque composer George Frideric Handel loosely based on Xerxes I of Persia, premiered in London.
 * 1802 – English poet William Wordsworth and his sister Dorothy encountered a "long belt" of daffodils while walking around Ullswater in the Lake District, inspiring him to pen his best-known work, "I Wandered Lonely as a Cloud".
 * 1861 – The Italian tricolour is adopted as national flag by the newly formed Kingdom of Italy.
 * 1912 – More than 1,500 people on the Titanic died when the passenger liner sank after colliding with an iceberg southeast of Newfoundland.
 * 1922 – U.S. senator John B. Kendrick (pictured) introduced a resolution calling for an investigation of a secret land deal involving U.S. president Warren G. Harding's administration, leading to the Teapot Dome scandal.
 * 1927 – Torrential rains caused the Mississippi River to break out of its levee system in at least 145 places, resulting in the worst flooding in the history of the United States.
 * 1947 – Jackie Robinson, the first African American to break the baseball color line, played his first game in Major League Baseball.
 * 1952 – The Boeing B-52 Stratofortress, a long-range, subsonic, jet-powered, strategic bomber operated by the U.S. Air Force for most of the aircraft's history, made its first flight.
 * 1957 – The Indiaman departed Victoria Coach Station, London, as part of the first UK–India bus service.
 * 1958 – On Walter O'Malley initiative, the Los Angeles Dodgers and San Francisco Giants played the first Major League Baseball game on the U.S. West Coast.
 * 1994 – At a GATT ministerial meeting in Marrakesh, Morocco, representatives of 123 countries and the European Communities signed an agreement to establish the World Trade Organization.
 * 2013 – Dzhokhar and Tamerlan Tsarnaev set off two pressure cooker bombs during the running of the Boston Marathon, killing three people and injuring 264 others.
 * Born/died: | Richard Poore |d|1237| Guru Arjan |b|1563| Robert Persons |d|1610| George Calvert, 1st Baron Baltimore |d|1632| Leonhard Euler |b|1707| Mikhail Lomonosov |d|1765| Wilhelm Busch |b|1832| Stanley Bruce |b|1883| Richard von Weizsäcker |b|1920| Robert W. Gore |b|1937| Hugh Thompson Jr. |b|1943| Emma Thompson |b|1959| Carol W. Greider |b|1961| Arsenio Lacson |d|1962| Dara Torres |b|1967| Milton Bradley |b|1978| Seth Rogen |b|1982| Greta Garbo |d|1990