As one of the annoying people who read all the books, I won't spoil anything re: what's to come, but if anyone is interested, Joffrey (Baratheon/Lannister) explains the fate of one of these main characters when he is taking Margaery through the sept of Baelor in GoT season 3 (while Olenna Tyrell, who later murders Joffrey, and Cersei, who later murders Margaery, walk and talk behind them).
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