Gregor Clegane, also known as The Mountain, is the older brother of The Hound.
Chiang Hsiao-wu ( ; also known as Alex Chiang ; April 25 , 1945 - July 1 , 1991 ) was the second son of Chiang Ching-kuo , the President of the Republic of China in Taiwan from 1978 to 1988 . 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 . Introduced in 1996 's A Game of Thrones , Gregor is the older brother of Sandor Clegane , from the fictional kingdom of Westeros . Ser Gregor Clegane is a huge knight and the elder brother of Sandor Clegane .