From A Wiki of Ice and Fire
|Book||The World of Ice & Fire (mentioned)|
Balon Blackskin is a legendary ironborn raider who supposedly lived during the Age of Heroes.
According to legend, Balon fought with an axe in his left hand and a hammer in his right. He was impervious to injuries from any man-made weapon: swords glanced off leaving no mark, while axes shattered against his skin.
- ↑ 1.0 1.1 The World of Ice & Fire, The Iron Islands.