Harum was the dominant personality in the council of personalities developed by Leto Atreides II to manage the tumult of his inner lives. It is unclear whether by accepting the presence of Harum in his consciousness above the presence of his other ancestors, Leto became abomination. He comments that by the judgement of the sisterhood, he may have done. Harum is said to have been a king in ancient Earth, presumably an Egyptian since Leto's style of ruling is referred as the pharaohs' model.