Cersei Lannister

Cersei is of Westeros by marriage to King Robert Baratheon, who abuses her throughout their marriage. Her father, Tywin, arranged the marriage after his attempt to betroth her to Prince Rhaegar Targaryen, whom she idolized as a child, failed. Robert took the Throne with the help of the Lannisters when he ended the Targaryen dynasty. Cersei has been involved in an incestuous affair with her twin brother, Jaime, since childhood. All three of Cersei's children are Jaime'