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According to The Lands of Ice and Fire companion book, Yi Ti is located on the far east side of Essos, a vast nation that stretches to the north of the Jade Sea coast and whose western border is a couple of hundred miles away from Qarth, the wealthy city visited by Daenerys in Game of Thrones ’ second season.
Beginning from the Great Council, that runs up to 129 AC, the established start date of the Targaryen civil war in the books. If that holds true, then it means a lot of the characters involved - certainly the children of Alicent - will be even younger in the show, a contrast to Game of Thrones' character ages, where most were older than the books.
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