Jaime Lannister is a fictional character from the book series "A Song of Ice and Fire" by George R.R. Martin, which was adapted into the television series Game of Thrones. He is known as the "Kingslayer" for killing King Aerys II Targaryen during the Robert's Rebellion. Jaime is a member of the Lannister family, one of the wealthiest and most powerful families in the Seven Kingdoms. Initially portrayed as arrogant and ruthless, Jaime's character evolves throughout the series. He is the twin brother of Cersei Lannister and has a complex relationship with Brienne of Tarth, which highlights his growth and moral dilemmas. Jaime's journey explores themes of honor, loyalty, and redemption.