Daughter of a younger brother of Lord Tytos Lannister, and so first cousin to Tywin, whom she had loved since childhood at Casterly Rock. She came to King's Landing as a girl of twelve to attend Princess Rhaella Targaryen, stood among her ladies at the royal wedding in 258 AC, and continued as one of Queen Rhaella's companions through the early years of the reign. In 263 AC, the year Tywin was raised to Hand of the King, Aerys II dismissed her from court; the smallfolk whispered the king had taken liberties with her on her wedding night, and the queen never had a lady-in-waiting half so close again. She wed Tywin that same year at Casterly Rock in a feast of seven days, and bore him the golden twins Cersei and Jaime in 266 AC.
For ten years she ruled the Rock at her husband's side, the only soul before whom Lord Tywin was ever known to laugh, until in 273 AC she came to childbed with a third babe and could not rise from it. She died bringing the dwarf Tyrion into the world at Casterly Rock, and Tywin laid down his Handship and rode home to bury her. He took no second wife and suffered no woman near him in love thereafter, and the loss settled into him as a cold and lasting thing that the realm felt for the rest of his days.