Lady Olenna Tyrell is the matriarch of House Tyrell and the political genius behind the family. After Robert's Rebellion, Lady Olenna discovered that Rhaegar I Targaryen survived and was in hiding in Winterfell alongside his wife, Lyanna Targaryen, and arranged to meet with them. She pledged her family's support in exchange for a marriage between her granddaughter, Margaery, and Prince Jaegon Targaryen. Since then, she has been secretly working to destabilize the Baratheons' reign.

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