Fed up of working for Taylor, who stole much of his glory despite being the lesser fighter, Broughton opened his own amphitheatre. Thanks to wealthy backers including the Duke of Cumberland, he was able to offer more luxurious surroundings than had previously been available to fight fans. However, the sport itself was unregulated and highly dangerous: fighting was bare-knuckled, supporters liked to see plenty of blood, and contests involved plenty of wrestling and dirty tactics as well as the punches we now associate with boxing. Rules were sometimes imposed, but they varied from match to match.
Broughton's rules included prohibitions on hitting a man while he was down or seizing him below the waist. A man who failed to rise within half a minute was considered beaten. Nonetheless, this was still bare-knuckle fighting which allowed a range of moves now forbidden. The sport existed in a context of incredibly brutal entertainment: Broughton's amphitheatre was also the venue for contests using weapons and for bear-baiting.
His other contributions to the game include the introduction of boxing gloves (for his gentleman pupils, not for prize fights) and a more scientific approach to the sport. He continued teaching until at least 1787, when he was in his mid-eighties, and died in 1789. Broughton's resting place is rather more prestigious than that of his old colleague and opponent George Taylor: he is buried in Westminster Abbey. However, he had similar issues with his gravestone: the epitaph he had chosen, 'Champion of England', was considered unsuitable and was only added in 1988 (with the additional word 'prizefighter' clarifying it).
Image: drawing of Jack Broughton by Marquess Townshend, from Wikipedia.