Theon Rosby is the current lord of Rosby and became so following the death of his father in a hunting incident.
Theon is the only child of the Lord of Rosby and so his parents were protective of him, particularly his mother. He had not been fostered anywhere in his childhood despite that fact that this was the norm. He was tutored at Rosby.
Theon is of average height, with short, jet black hair and he is not very robust.
Theon decided to leave Rosby to travel Westeros but his father would only allow him to travel south towards the Reach, Dorne and the Stormlands.