The term "Lannister" refers to a prominent family in the fictional world of A Song of Ice and Fire, a series of novels by George R.R. Martin, and its television adaptation, Game of Thrones. The Lannisters are known for their wealth, political influence, and the motto "Hear Me Roar!" They hail from the Westerlands and reside in the castle of Casterly Rock. Key members of the Lannister family include Tywin Lannister, the patriarch, and his children, Cersei, Jaime, and Tyrion. The family is often depicted as cunning and ambitious, playing a significant role in the power struggles of the Seven Kingdoms. Their complex relationships and moral ambiguities contribute to the series' intricate plot.