Carn Brea is a big hill to the south-west of the town of Redruth in Cornwall, which like every other hill in Cornwall was once the home of a giant. In this case the giant went by the name of John of Gaunt. Whether he was a relation of the other John of Gaunt or even came from Belgium, no one knows.
This John of Gaunt spent his time fighting with a neighbouring giant by the name of Bolster who lived on St Agnes Beacon. It is said that the reason that Carn Brae is covered in boulders whereas St Agnes Beacon is quite bare of such rocks, is that Bolster had thrown them all at his enemy John. Which would I think lead one to conclude that John got the worst of it.
What happened to John is not recorded, although people do say that you can see his petrified head sticking out from the top of Carn Brae.