Cersei Lannister: Cersei (Lena Headey) is doing her best to influence and protect her son, King Joffrey, both from his enemies and himself. After his cowardliness at the Battle of Blackwater Bay, her life has become that much more complicated. Tyrion may be out to get her for the attempt on his life. Back Story: Cersei is widow of King Robert Baratheon and Queen Regent of the Seven Kingdoms. She installs Joffrey on the throne, fawning him off as the son of Robert. He’s actually the spawn of an incestuous affair with brother Jaime Lannister.