Theon Greyjoy (Alfie Allen) Theon Greyjoy is the youngest son of Lord Balon Greyjoy and Alannys Harlaw. He is the older brother of Yara.Theon became a ward of Lord Eddard Ned Stark at Winterfell when he was ten after the failure of Balon Greyjoy's rebellion, where he remained until he was 19. He became close with the Stark family, especially the sons, particular Robb, and became like a surrogate son to Ned, even though technically he was more of a captive.Theon is not the smartest person at Winterfell although he fancies himself quite bright. He is petulant. He enjoys the company of the ladies.