Wikipedia:Selected anniversaries/December 20

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 * 1248 – Attempting to form an alliance with the Mongol Empire, Louis IX of France met with two of their envoys while en route to the Seventh Crusade.
 * 1955 – Cardiff was recognised as the capital of Wales by the British government.
 * 1984 – Twelve-year-old Jonelle Matthews disappeared from her home in Greeley, Colorado; her body was not discovered until 2019.
 * 1987 – The deadliest peacetime maritime disaster in history occurred when the MV Doña Paz sank after colliding with an oil tanker in the Tablas Strait in the Philippines, resulting in an estimated 4,385 deaths.
 * 1988 – The United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, governing international cooperation against the illegal drug trade, opened for signatures.
 * 1995 – American Airlines Flight 965 crashed into a mountain in Buga, Colombia, killing most of those on board.
 * 2007 – Pablo Picasso's Portrait of Suzanne Bloch was stolen from the São Paulo Museum of Art before being recovered about three weeks later.
 * Born/died this day: | Pope Zephyrinus |d|217|  Richard Boyle, 2nd Viscount Shannon |d|1740| John Bell |d|1820| Dan Leno |b|1860| Kan'ichi Asakawa |b|1873|  Evelyn Colon |d|1976| Beatrice Beeby |d|1991| Dawn Steel |d|1997

December 20


 * 1852 – Led by George Cathcart, British troops defeated Basuto and Taung forces at the Battle of Berea in present-day Lesotho, leading to an offer of peace from King Moshoeshoe I.
 * 1940 – The superhero Captain America made his first published appearance in the comic book Captain America Comics #1.
 * 1980 – NBC aired the American football match between the New York Jets and the Miami Dolphins without announcers.
 * 1995 – Mandated by the Dayton Agreement that ended the Bosnian War, the NATO-led Implementation Force (troops pictured) began peacekeeping operations in Bosnia and Herzegovina.
 * 1999 – Portugal transferred the sovereignty over Macau, which it had administered since the mid–16th century, to China.