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Black Monday is a term used to refer to certain events which occurred on a Monday. It has been used in the following cases:
- Black Monday, Dublin, 1209 – when a group of 500 recently arrived settlers from Bristol were massacred by warriors of the Gaelic O'Byrne clan. The group had left the safety of the walled city of Dublin to celebrate Easter Monday near a wood at Ranelagh, when they were attacked without warning. Although now a relatively obscure event in history, it was commemorated by a mustering of the Mayor, Sheriffs and soldiers on the day as a challenge to the native tribes for centuries afterwards.
- Black Monday, 14 April 1360 – the army of Edward III during the Hundred Years' War was struck by hailstorms, lightning and panic, causing considerable loss of life on Easter Monday.
- Black Monday, 27 February 1865 – a "sirocco" wind brought sandstorms to Melbourne, Australia affecting Sandhurst and Castlemaine.
- Black Monday, 8 February 1886 – when a major protest over unemployment led to a riot in Pall Mall, London.
- Black Monday, December 10, 1894 – when both banks of Newfoundland, Britain’s oldest colony, had closed their doors, thus rendering that colony’s main medium of exchange worthless.
- Black Monday, 28 October 1929 – a day in the Wall Street Crash of 1929, which also saw major stock market upheaval.
- Black Monday, 27 May 1935 – US Supreme Court Justices overturned multiple Acts including National Industrial Recovery Act.
- Black Monday, September 19, 1977 – when Youngstown Sheet and Tube Company, one of America's largest regional steel-manufacturing firms, announced that it would shut down most of its operations in the vicinity of Youngstown, Ohio, placing 5,000 people out of work. This development presaged the collapse of that community's industrial economy, from which it still hasn't recovered (as of 2010).
- Black Monday, 27 November 1978 - when former San Francisco Supervisor Dan White assassinated Mayor George Moscone and current Supervisor Harvey Milk.
- Black Monday, Malta, 15 October 1979 – the offices of The Times of Malta were set on fire during a political rally. It was also on this day that supporters of the Malta Labour Party broke into the house of Dr. Edward Fenech Adami.
- Black Monday, 19 October 1987 – the largest one-day percentage decline in recorded stock market history.
- Black Monday, or Al Aqsa Massacre, 8 October 1990.
- Black Monday, 20 July 2009 – Only 330 of the 1,260 of the Berlin S-Bahn's train cars were good for operation. Earlier in the month 380 (30.2%) train cars were removed, making the total removed on 20 July was at 550 (43.7%). Only 26.2% of the train cars were available on 20 July 2009.
- Black Monday, 8 August 2011, US and global stock markets crashed following the Friday night credit rating downgrade by Standard and Poor's of the United States sovereign debt from AAA, or "risk free", to AA+. By market close, the Dow Jones Industrial Average lost 634.76 points (-5.55%) to close at 10,809.85, the NASDAQ Composite Index fall 174.72 points (-6.90%) closing at 2,357.69, the S&P 500 Index shed 79.92 points (-6.66%), and the New York Stock Exchange lost an astounding 523.02 points (-7.05%), finishing the day at 6,896.05. Both the Dow Jones Industrial Average and the NASDAQ Composite Index ended the day at their session lows.
- The day following the final Sunday of the National Football League season (Week 17) in which coaches and administration are fired or resign their position. The term is also attributed to the day following the annual NFL Draft where players' contracts may be terminated once new players are added to a roster.
- The Monday of Match Week when United States 4th year medical students find out if but not where they matched to a residency position through the National Resident Matching Program.
- Events described by both the Late-2000s recession and the Late-2000s financial crisis
- An old schoolboys' nickname for the first Monday after the holidays.