Cersei Lannister is a prominent character from the fantasy series A Song of Ice and Fire by George R.R. Martin, which was adapted into the television show Game of Thrones. She is the daughter of Tywin Lannister and twin sister of Jaime Lannister. Cersei is known for her intelligence, ambition, and ruthless nature, often using manipulation to achieve her goals. As the Queen of the Seven Kingdoms, Cersei seeks power and control, often prioritizing her family's legacy above all else. Her relationship with her children, particularly Joffrey Baratheon, plays a significant role in her actions throughout the series. Cersei's character embodies themes of power, betrayal, and the complexities of family loyalty.