In a world that George R.R. Martin has filled with irredeemable characters, The Mountain That Rides may just be the worst — the murderous knight otherwise known as Ser Gregor Clegane has been responsible for some of the most shocking moments in Game of Thrones and the A Song of Ice and Fire novels. But the man who plays The Mountain in Game of Thrones fourth season, Hafþór Thor Björnsson, is a pretty formidable character himself; the Icelandic giant was crowned Europes Strongest Man earlier this month in Leeds, England. …