Premise: Ser Gregor Clegane , nicknamed The Mountain , is a fictional character in the A Song of Ice and Fire series of fantasy novels by American author George R. R. Martin , and its television adaptation Game of Thrones . Called `` The Mountain That Rides '' , he is known for his incredibly cruel nature and uncontrollable temper .
Hypothesis: Gregor Clegane is nicknamed The Mountain.
Label: ENTAILMENT