Jamie Lannister is a fictional character from the popular series A Song of Ice and Fire by George R.R. Martin, which was adapted into the television show Game of Thrones. He is known as the "Kingslayer" for killing King Aerys II Targaryen during Robert's Rebellion. Jamie is a skilled knight and a member of the Kingsguard, sworn to protect the royal family. Throughout the series, Jamie's character evolves from a seemingly arrogant and ruthless individual to a more complex figure. He struggles with his identity, loyalty, and the consequences of his past actions, particularly his relationship with his sister, Cersei Lannister, and his growing bond with Brienne of Tarth.