House Lannister is one of the Great Houses of Westeros in the fictional world of A Song of Ice and Fire by George R.R. Martin. They are known for their wealth, primarily derived from gold mines in the region of Casterly Rock. The house motto is "Hear Me Roar!" and their sigil features a golden lion on a crimson background. The Lannisters are often characterized by their cunning and ambition. Key members include Tywin Lannister, the patriarch, and his children: Cersei, Jaime, and Tyrion. They play a significant role in the political intrigues of the Seven Kingdoms, often seeking power and influence.