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Theon Greyjoy was a prominent character portrayed by Alfie Allen in the popular television series "Game of Thrones." As the heir to the Iron Islands, Theon grapples with divided loyalties and conflicting identities throughout the show. Initially a ward of the Starks, he later becomes entangled in the intricate web of power struggles in Westeros, leading to tumultuous experiences that significantly shape his character arc and test his allegiances.