"Mendes, such a strange name"- Cersei to Shawn
Queen Cersei I Lannister is the widow of King Robert Baratheon and Queen of the Seven Kingdoms. She is the daughter of Lord Tywin Lannister, twin sister of Jaime Lannister and elder sister of Tyrion Lannister. She has an incestuous relationship with Jaime, who is secretly the father of her three children, Joffrey, Myrcella and Tommen.
After the assassinations of Joffrey and Myrcella and Tommen's suicide in the wake of the destruction of the Great Sept of Baelor, Cersei assumed the throne under the name of Cersei of the House Lannister, the First of Her Name, Queen of the Andals and the First Men, Protector of the Seven Kingdoms.
Cersei is known to have a very vile and nerfarious mindset too which mirrors Aerys II the Mad King at times
(source GOT wiki)