Wikipedia:Selected anniversaries/July 27

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 * 678 – Unable to penetrate the city's defences, the Sclaveni gave up their siege of the Byzantine city of Thessalonica.
 * 1225 – Saint Mary's Church on Gotland, later to become Visby Cathedral, was consecrated.
 * 1302 – Byzantine–Ottoman wars: The Ottoman sultanate gained its first major victory against the Byzantine Empire at the Battle of Bapheus in Bithynia.
 * 1689 – First Jacobite rising: Scottish and Irish Jacobites defeated Williamite forces at Killiecrankie, Scotland.
 * 1778 – The Battle of Ushant, the first encounter between the French and British fleets in the American Revolutionary War, ended indecisively and led to political disputes in both countries.
 * 1919 – Red Summer: Race riots erupted in Chicago after a racial incident occurred on a South Side beach, leading to 38 fatalities and 537 injuries.
 * 1942 – Second World War: Allied forces halted the Axis invasion of Egypt at the First Battle of El Alamein.
 * 1943 – As the Surprise Hurricane struck Texas, a United States Army Air Forces pilot made the first reconnaissance flight into a hurricane.
 * 1953 – An armistice was signed (pictured) to end hostilities in the Korean War, officially making the division of Korea indefinite by creating a 4 km wide (2.5 mi) demilitarized zone across the Korean Peninsula.
 * 1955 – The Austrian State Treaty came into effect, ending the Allied occupation of Austria, although the country was not free of Allied troops until October.
 * 1955 – After straying into Bulgarian airspace, El Al Flight 402 was shot down by two MiG-15 fighter jets, resulting in the deaths of all 58 on board.
 * 1983 – American musician Madonna released her self-titled debut album, which set the standard for the genre of dance-pop for decades.
 * 2007 – While covering a police pursuit in Phoenix, Arizona, two news helicopters collided in mid-air, killing both crews.
 * 2010 – Police in Tokyo found the mummified remains of Sogen Kato, thought to have died in 1978, leading to widespread inquiries into the status of isolated elderly people in Japan.
 * 2016 – The last nine Aston Martin DB9 units rolled off the production line, marking the end of a twelve-year manufacturing period.
 * Born/died: | Conrad II of Italy |d|1101| Frances Stewart, Duchess of Lennox|b|1578| Jeanne Baret|b|1740| Elizabeth Plankinton|b|1853| Iwane Matsui|b|1878| Joe Tinker|bd|1880; 1948| Kenneth Bainbridge|b|1904| Emil Theodor Kocher|d|1917| Wu Zhonghua|b|1917| Norman Lear|b|1922| Ferruccio Busoni|d|1924| Neil Brooks|b|1962| Alfred Duraiappah|d|1975| Shannon Moore|b|1979| Elizabeth Rona|d|1981| Max Scherzer|b|1984| Maya Ali|b|1989| A. P. J. Abdul Kalam|d|2015|