Bull Demon King (牛魔王, Niú mówáng)?, also known as the Ox King and the Great Sage Who Pacifies Heaven, is a major antagonist from the 16th century novel Journey to the West. He is one of the most popular Journey to the West villains, alongside his wife Princess Iron Fan, his son the Red Boy, the Six Eared Macaque, and the Baigujing. In the early chapters, he becomes sworn brothers with Sun Wukong and six other demon kings. He is ranked the most senior of the seven.