Ser Jaime Lannister is a fictional character from the book series "A Song of Ice and Fire" by George R.R. Martin and the television adaptation, Game of Thrones. He is a member of the Kingsguard, sworn to protect the king, and is known for his exceptional swordsmanship and combat skills. Jaime is the eldest son of Tywin Lannister and the twin brother of Cersei Lannister. Initially portrayed as arrogant and ruthless, Jaime's character evolves throughout the series. He struggles with his identity and the consequences of his actions, particularly regarding his relationship with Brienne of Tarth. His journey explores themes of honor, redemption, and the complexities of loyalty.