The rumor that Dame Diana Rigg will be portraying hte Queen of Thorns has been circulating for a few days now, but it appears to legitimate according to The Daily Mail Online.
"Diana Rigg (pictured), who will play Olenna Redwyne, aka Queen of Thorns (because of her sharp-tongue and prickliness), the wily grandmother of Margaery Tyrell in the third season of the highly popular drama series Game Of Thrones, which will start shooting next month.
The actress will be a semi-regular character throughout the third series of the show, which is based on George R.R. Martin’s best-selling novels. Olenna is a powerful, domineering matriarch and queen, who’s a mistress of the art of manipulation."
Olenna Redwyne is Mace Tyrell's mother and the grandmother of Loras and Margery Tyrell. She is very old and small with white hair. Often known by her nickname 'The Queen of Thorns', Lady Olenna rarely shies away from stating her opinion. She is described as a wizened, cunning old woman with a wicked and sharp tongue.
Of course HBO has yet to confirm this or any casting for Season 3. Perhaps Comic-Con will bring some official news and confirmation for many of the casting rumors out there.
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