Cersei Lannister
From Asoiaf
Queen Cersei of House Lannister is the daughter of Tywin Lannister, Lord of Casterly Rock and Lady Joanna. Ser Jaime is her twin brother. She is married to Robert I of House Baratheon, King of the Seven Kingdoms. They have three children, Prince Joffrey, Princess Myrcella and Prince Tommen.
Her mother died in childbed.