Howard Winstone, Johnny Owen, Joe Calzaghe: why have the south Wales valleys produced so many boxing champions?
As part of BBC Cymru Wales' Real Valleys season, we're bringing you a special documentary - The Valleys Fighter - as Liam Williams, a young boxer from Clydach Vale, follows in the footsteps of legendary fighters and heads towards his first professional title.
To get you in the mood, we've dug out this brilliant archive documentary on Newbridge's former world champion Gavin Rees. Here's what happened when Sport Wales followed 'The Rock' to his showdown with Adrien Broner in Atlantic City back in 2013.
The Valleys Fighter airs on BBC One Wales at 10.45pm on Monday, 30 March.