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He was the first person to codify a set of rules to be used in such contests; prior to this the "rules" that existed were very loosely defined and tended to vary from contest to contest. His seven rules of how boxing  would be conducted at his amphitheatre (the largest and most influential at that time) evolved later into the London Prize Ring rules which are widely regarded as the foundation stone of the sport that would become boxing, prior to the development of the Marquess of Queensberry rules in the 1860s.
As a result of his status in boxing, and with help from a number of wealthy patrons, he opened his own amphitheatre in Hanway Road, near Oxford Street. Here, Broughton and his team staged boxing exhibitions.
Broughton drew up a set of rules for the sport that were regarded as definitive for around 100 years. The rules stipulated that a round would last until a man went down, and there was to be a 30-second interval between rounds.
In 1750 he fought Jack Slack. After 14 minutes of the fight, as a result of a blinding punch, Broughton was unable to see his man, and thus had to retire from the bout. The Duke of Cumberland, Broughton's patron at the time was said to have lost thousands of pounds on the match. After the fight he closed his amphitheatre, and instead ran an antiques business.
Broughton was one of the original inductees of the International Boxing Hall of Fame, inducted as a pioneer of the sport.
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