Cersei Lannister: If the Mad King's daughter takes the Iron Throne, she'll destroy the Realm as we know it. Some of you are bannermen of House Tyrell, but House Tyrell is in open rebellion against the crown. With their help, the Mad King's daughter has ferried an army of savages to our shores: mindless Unsullied soldiers who will destroy your castles and your holdfasts; Dothraki heathens, who will burn your villages to the ground, rape and enslave your women and butcher your children without a second thought. This is how Olenna Tyrell rewards centuries of service and loyalty.
Cersei Lannister: You will remember the Mad King. You remember the horrors he inflicted upon his people. His daughter is no different. In Essos, her brutality is already legendary. She crucified hundreds of noble men in Slaver's Bay, and when she grew bored of that, she fed them to her dragons.
Cersei Lannister: It is my solemn duty to protect the people and I will, but I need your help, my lords. We must stand together. All of us, if we hope to stop her.
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From: Game of Thrones