Events Pre-1600 489 – The Ostrogoths under Theoderic the Great defeat the forces of Odoacer for the second time. 737 – The Turgesh drive back an Umayyad invasion of Khuttal, follow them south of the Oxus, and capture their baggage train. 1139 – A magnitude 7.7 earthquake strikes the Caucasus mountains in the Seljuk Empire, causing mass destruction and killing up to 300,000 people. 1399 – Henry IV is proclaimed king of England. 1520 – Suleiman the Magnificent is proclaimed sultan of the Ottoman Empire. 1541 – Spanish conquistador Hernando de Soto and his forces enter Tula territory in present-day western Arkansas, encountering fierce resistance. 1551 – A coup by the military establishment of Japan's Ōuchi clan forces their lord to commit suicide, and their city is burned. 1601–1900 1744 – War of the Austrian Succession: France and Spain defeat Sardinia at the Battle of Madonna dell'Olmo, but soon have to withdraw from Sardinia anyway. 1791 – The first performance of Mozart's opera The Magic Flute takes place two months before his death. 1791 – France's National Constituent Assembly is dissolved, to be replaced the next day by the National Legislative Assembly. 1863 – Georges Bizet's opera Les pêcheurs de perles, premiered in Paris. 1882 – Thomas Edison's first commercial hydroelectric power plant (later known as Appleton Edison Light Company) begins operation. 1888 – Jack the Ripper kills his third and fourth victims, Elizabeth Stride and Catherine Eddowes. 1901–present 1906 – The Royal Galician Academy, the Galician language's biggest linguistic authority, starts working in La Coruña, Spain. 1907 – The McKinley National Memorial, the final resting place of assassinated U.S. President William McKinley and his family, is dedicated in Canton, Ohio. 1909 – The Cunard Line's RMS Mauretania makes a record-breaking westbound crossing of the Atlantic, that will not be bettered for 20 years. 1915 – World War I: Radoje Ljutovac becomes the first soldier in history to shoot down an enemy aircraft with ground-to-air fire. 1918 – Ukrainian War of Independence: Insurgent forces led by Nestor Makhno defeat the Central Powers at the battle of Dibrivka. 1935 – The Hoover Dam, astride the border between the U.S. states of Arizona and Nevada, is dedicated. 1938 – Britain, France, Germany and Italy sign the Munich Agreement, whereby Germany annexes the Sudetenland region of Czechoslovakia. 1938 – The League of Nations unanimously outlaws "intentional bombings of civilian populations". 1939 – World