Bull Demon King

Bull Demon King (Chinese: 牛魔王; pinyin: Niú Mówáng), also translated as the Ox King, also-known by his self-proclaimed title the Great Sage Who Pacifies Heaven (Chinese: 平天大聖; pinyin: Píngtiān Dàshèng), and as Dàliwáng (大力王; "King [of] Great Might"/"King Powerful") and as Niú Dàli (牛大力; 'Great Might/Powerful Bull/Ox'), is a character and demon from the 16th century novel Journey to the West.

He is the estranged-husband of the Princess Iron Fan and father of Red Boy. He is a demon king originally-based in the "Palm leaf Cave/Grotto" (棕櫚葉洞; Zōnglǘyèdòng), up on "Jade Cloud Mountain" (玉雲山; Yùyúnshān), with his wife, before betraying his wife for a younger demoness, Princess Jade-Countenance, a female Huli jing, of the "Sky-Scraping Cave" (摩雲洞; Móyún-dòng) on "Accumulated-Thunder Mountain" (积雷山; 積雷山; Jīléi-shān).

Bull King is a major antagonist in the novel Journey to the West by Wu Cheng'en and its many adaptations. He is especially portrayed as the main antagonist in several remakes of Journey to the West, despite his limited appearances in the original novel. 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.

He was possibly influenced by Ox-Head, one of the guardians of hell in Chinese mythology.