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  == Character description ==
  Ser Gregor Clegane, known as the Mountain That Rides, or simply the Mountain, is the older brother of Sandor Clegane and is a vassal to Tywin Lannister. His size and strength make him a fearsome warrior (in the novels he is nearly 8 feet tall, and weighs over 400 lbs.), and he has earned a reputation for brutality. When they were children, Gregor shoved Sandor's face into a brazier for using his toy, gruesomely scarring him. Over the course of his service to House Lannister, he has committed numerous war crimes, but he is most infamous for the rape and murder of the Targaryen/Martell royal family. Clegane was one of the first Lannister soldiers to enter King's Landing during its sack at the end of Robert Baratheon's rebellion. He raped and murdered Princess Elia, and murdered her children Rhaenys and Aegon, a grudge House Martell still bears at the onset of ''A Game of Thrones''.
  Gregor Clegane is not a point of view character in the novels, so his actions are witnessed and interpreted through the eyes of other people, such as Arya Stark and Cersei Lannister. Gregor is mostly a background character in the novels.