Wikipedia:Selected anniversaries/May 20

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 * 685 – The Picts defeated the Northumbrians at the Battle of Dun Nechtain, severely weakening the latter's power in northern Great Britain.
 * 1515 – Ulysses, who would be famously depicted in a posthumous woodcut, landed in Lisbon, becoming the first of his species to visit Europe in a thousand years.
 * 1609 – Thomas Thorpe published the first copies of Shakespeare's sonnets, possibly without William Shakespeare's consent.
 * 1811 – A British squadron under Charles Marsh Schomberg defeated a French force off Tamatave, Madagascar, that was attempting to reinforce the French garrison on Mauritius.
 * 1875 – Representatives from seventeen countries signed the Metre Convention, which set up an institute for the purpose of coordinating international metrology and for coordinating the development of the metric system.
 * 1927 – By the Treaty of Jeddah, the United Kingdom recognised the sovereignty of King Abdulaziz of Saudi Arabia (pictured) over Hejaz and Nejd, which later merged to become Saudi Arabia.
 * 1943 – The Luttra Woman, a bog body from the Early Neolithic period, was discovered near Luttra, Sweden.
 * 1947 – The first session of the National Diet opened in Tokyo, Japan.
 * 1965 – While attempting to land at Cairo International Airport, Pakistan International Airlines Flight 705 crashed for unknown reasons, killing all but 6 of the 121 people on board.
 * 1996 – In deciding Romer v. Evans, the U.S. Supreme Court struck down a constitutional amendment in Colorado that prevented protected status under the law for homosexuals or bisexuals.
 * 2012 – The first of two major earthquakes struck Northern Italy, resulting in seven deaths.
 * 2013 – A tornado struck Moore, Oklahoma, United States, killing 24 people and causing an estimated $2 billion of damage.
 * Born/died: | Gero |d|965| Thado Minsaw of Ava |b|1531| John W. Beschter |b|1763| Honoré de Balzac |b|1799| Hieronymus von Colloredo |d|1812| Aleksandra Boiko |b|1918| Astrid Kirchherr |b|1938| Cher |b|1946| Yoshihiko Noda |b|1957| Pat Collins |d|1960| Šárka Kašpárková |b|1971|