Ser Gregor Clegane, or, "The Mountain" is a Lannister bannerman. He is the brother of Sandor Clegane, who hates him and wishes to kill him. Gregor is well known as a sociopath, rapist, and murderer; he routinely tortured Sandor when they were younger, once shoving his face into a flaming brazier, raped and murdered Elia of Dorne during the Sack of King's Landing, and also slaughtered her infant son, Aegon. Gregor faces Oberyn Martell in single combat and is gravely injured. His sigil is three dogs on a yellow field.