Eldest daughter of Lord Tywin Lannister of Casterly Rock, Cersei is twin to Ser Jaime Lannister, the Kingslayer. Blonde, green-eyed, and one of the most beautiful women in the Seven Kingdoms, she has the Lannister pride and the ferocity of the mother lion when her children by King Robert are endangered. Her marriage to the king is loveless—a political marriage only, to secure her father’s allegiance after Robert won the Iron Throne—and their conflicts can be brutal. Her brother Jaime is often by her side, serving as her sworn shield as one of the knights of the Kingsguard. Her other brother Tyrion, however, is an affront to her sensibilities, and she denigrates the Imp mercilessly.
Cersei is busy with preparations for Joffrey’s wedding, Cersei reveals herself to be concerned about what Tyrion will say to Tywin about her relationship to Jaime, as well as displaying a marked jealousy and suspicion of Margaery Tyrell. Tensions with Joffrey grow over this, as he continually denegrates her and pushes her aside. She tries to convince her father to mistrust the Tyrells, but he pushes her concerns largely aside, seeing the matter pragmatically. He later reveals his intention to have her wed Loras Tyrell to firm up the alliance with Highgarden, to which she objects uselessly. She is ultimately reunited with Jaime, but is clearly troubled by the loss of his hand.