Bare-knuckle boxing rose to popularity in the 17th Century before regulation in the 1800s forced competitors underground.
The sport rose to prominence again in the mid 2000s through promoter Corey Williams in the US – where it is still an illegal sport under the Queensberry ruling.
And now it is making an impression in the UK, after Jim Freeman and Joe Brown founded BKB – the UK's first professional bare-knuckle boxing organisation – five years ago.