The Lannisters are one of the prominent families in the fictional world of Westeros, created by author George R.R. Martin in his series, A Song of Ice and Fire. They are known for their wealth, political influence, and the motto "Hear Me Roar!" The family is based in Casterly Rock and has a reputation for cunning and ambition. Key members of the Lannister family include Tywin Lannister, the patriarch, and his children, Cersei, Jaime, and Tyrion. The Lannisters play a significant role in the power struggles of the realm, often engaging in alliances and conflicts with other noble houses, such as the Starks and Baratheons.