<P> The same year , Rigg secured a recurring role in the third season of the HBO series Game of Thrones , portraying Lady Olenna Tyrell , a witty and sarcastic political mastermind popularly known as the Queen of Thorns , the grandmother of regular character Margaery Tyrell . Her performance was well received by critics and audiences alike , and earned her an Emmy nomination for Outstanding Guest Actress in a Drama Series for the 65th Primetime Emmy Awards in 2013 . She reprised her role in season four of Game of Thrones , and in July 2014 received another Guest Actress Emmy nomination . In 2015 and 2016 , she again reprised the role in seasons five and six in an expanded role from the books . The character was finally killed off in the seventh season , with Rigg 's final performance receiving critical acclaim . </P>
who plays the grandmother in game of thrones
Rigg