Cersei Lannister is part of the rich and powerful Lannister family, one of the ruling families of Westeros. She lives in The Red Keep in King’s Landing. At the beginning of the story, she is married to King Robert Baratheon, but becomes a widow when he dies. She is one of the key players in the Game of Thrones and is known for her manipulative and often brutal schemes to keep her family in power. She has an incestuous relationship with her brother Jamie, who is the actual father of her three children.