Wikipedia:Selected anniversaries/May 22

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 * 853 – Arab–Byzantine wars: The Byzantine navy began a raid on the Nile Delta port city of Damietta, whose garrison was absent at the time.
 * 1629 – Albrecht von Wallenstein and King Christian IV of Denmark signed the Treaty of Lübeck to end Danish intervention in the Thirty Years' War.
 * 1762 – The Trevi Fountain (pictured) in Rome was officially inaugurated by Pope Clement XIII.
 * 1816 – A riot broke out in Littleport, England, over high unemployment and rising grain costs, spreading to Ely the next day before being quelled by troops.
 * 1826 – HMS Beagle departed on her first voyage from Plymouth for a hydrographic survey of the Patagonia and Tierra del Fuego regions of South America.
 * 1844 – In Shiraz, Iran, the Báb declared himself to be a messenger of God to Mullá Husayn, leading to the foundation of Bábism, considered to be a precursor to the Baháʼí Faith.
 * 1849 – Abraham Lincoln was issued a patent for an invention to lift boats over obstacles in a river, making him the only U.S. president ever to hold a patent.
 * 1856 – Senator Charles Sumner (pictured) was assaulted by Representative Preston Brooks in the United States Senate chamber in retaliation for a speech in which Sumner fiercely criticized slaveholders.
 * 1897 – The first Blackwall Tunnel under the River Thames was opened to improve commerce and trade in the East End of London.
 * 1905 – Sultan Abdul Hamid II established the Ullah millet, a separate millet for the Aromanians within the Ottoman Empire.
 * 1915 – California's Lassen Peak violently erupted, the only volcanic eruption in the contiguous U.S. in the 20th century until Mount St. Helens erupted in 1980.
 * 1939 – Germany and Italy signed the Pact of Steel, a military and political alliance.
 * 1958 – Ethnic riots mostly targeting the minority Sri Lankan Tamils broke out in Ceylon, resulting in at least 158 deaths over the next few days.
 * 1960 – The most powerful earthquake ever recorded, registering approximately 9.5 Mw, struck near Valdivia, Chile, generating tsunamis that reached Hawaii and Japan.
 * 1972 – The Dominion of Ceylon changed its name to Sri Lanka, adopted a new constitution, and officially became a republic within the Commonwealth.
 * 1980 – Location testing for Pac-Man, a Japanese arcade game that became an icon of 1980s popular culture, began in Shibuya, Tokyo.
 * 1987 – During Hindu–Muslim rioting in Meerut, India, 19 members of the Provincial Armed Constabulary allegedly massacred 42 Muslims and dumped their bodies in water canals.
 * 2002 – Police announced that the skeletal remains of Federal Bureau of Prisons intern Chandra Levy, who had been missing for a year, had been found in Rock Creek Park in Washington, D.C.
 * 2010 – Upon landing in Mangalore, Air India Express Flight 812 overshot the runway and fell down a hillside, killing 158 of the 166 people on board.
 * Born/died: | Magnus Stenbock |b|1665| Martha Washington |d|1802| Richard Wagner |b|1813| Rita Cetina Gutiérrez |b|1846| Fritz von Uhde |b|1848|Tom Driberg|b|1905| Laurence Olivier |b|1907| T. Boone Pickens  |b|1928| Lady Gregory |d|1932| Myrtle Bachelder |d|1997|