Last updated: 01-18-2023
Ever since I published my article “The Monkey King’s Children” (2021), I’ve noticed that people have fallen in love with Sun Wukong’s monstrous, magic skull-wielding daughter Yuebei xing (月孛星, “Moon Comet Star”) from Journey to the South (Nanyouji, 南遊記, 17th-century). For instance, search Tumblr and you will find plenty of art and short stories featuring her. The character does not appear in the original Journey to the West (Xiyouji, 西遊記, 1592) novel, so I’m honestly surprised that she has captured the imagination of so many.
Here, I would like to collect all that I’ve written about her, along with new information, into a single article. This piece discusses her brief character arc, her astrological origins, her appearance in other literature, and her religious iconography.
I. Character arc
In chapter 17 of Journey to the South, Sun Wukong is framed for once again stealing immortal peaches. The Jade Emperor threatens to remand him to the Buddha for punishment but is convinced to give him a month-long reprieve to find the true culprit. Monkey returns to the Mountain of Flowers and Fruit, and it is here, among his people, that the story briefly mentions three children, including sons Jidu (奇都, “Ketu”) and Luohou (羅猴, “Rahu”) and daughter Yuebei xing (月孛星, “Moon Comet Star”).
Sun eventually seeks out Guanyin, who reveals that the troublemaker is the rogue immortal Huaguang (華光). Returning home once more, Monkey’s news prompts his daughter to volunteer to battle the impostor. But her tribe simply pokes fun at her monstrous appearance. Yuebei Xing is said to have a crooked head with huge eyes and a broad mouth, coarse hands, a wide waist, and long legs with thunderous steps.
Sun travels with his daughter to Huaguang’s home of Mt. Lilou (Lilou shan, 離婁山) to provoke battle by chastising him for stealing the immortal peaches. Monkey strikes at him with his magic staff, causing Huaguang to deploy his heavenly treasure, a golden, triangular brick (sanjiao jinzhuan, 三角金磚). But Sun responds by creating untold monkey clones that not only confiscate the weapon but also overwhelm the immortal. Huaguang is seemingly defeated at this point; however, he manages to deploy one last treasure, the Fire Elixir (Huodan, 火丹). This weapon engulfs the Great Sage in heavenly flame (akin to the Red Boy episode), causing him to flee to the Eastern Sea. Yuebei xing then calls Huaguang’s name while holding her own magic treasure, a skull (kulou tou, 骷髏頭). The immortal is immediately stricken with a headache and stumbles back to his cave in a daze. Her weapon is said to be quite dangerous; anyone whose name is called will die within three days.
Huanguang’s religious teacher, the Flame King Buddha of Light (Huoyan wang guangfo, 火炎王光佛), then intervenes in order to sooth the situation between his disciple and the Great Sage. He promises to bring the rogue immortal to justice on the condition that Yuebei Xing withdraws her deadly magic. In the end, all parties are pardoned by the Jade Emperor, and Huaguang and Monkey become bond brothers (Yu, n.d.).
II. Astrological origins
The Monkey King’s daughter is based on Yuebei xing, a shadowy planetary deity representing the lunar apogee, or the furthest point in the moon’s orbit. They are counted among the “Eleven Luminaries” (Shiyi yao, 十一曜) of East Asian astrology (fig. 1). These include the “Nine Planets” (Sk: Navagraha; Ch: Jiuyao, 九曜, “Nine Luminaries”) of Hindu astrology, namely the Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn, and Rahu and Ketu (Gansten, 2009), as well as Yuebei and another shadowy planet called Ziqi (紫氣/紫炁; “Purple Mist”) (Kotyk, 2017, p. 60). The latter two are mentioned in Daoist writings as early as the late-9th-century (Kotyk, 2017, pp. 61-62).
Fig. 1 – A Chinese depiction of the Eleven Luminaries from the Ink Treasure of Wu Daozi (Daozi mobao, 道子墨寶, c. 13th-century) (larger version). Yuebei xing is located first from the left on the top row. Image found here.
The late-Yuan to early-Ming scripture Secret Practice of the Primordial Lord Yuebei (Yuanhuang Yuebei mifa, 元皇月孛祕法; Secret Practice hereafter) describes them having two forms, one human and the other monstrous:
Surnamed Zhu [Vermillion] with the honorific title of Guang [Luminous]. In the form of a celestial human, their hair is let down over their naked body. Their mass of black hair covers the navel. Red sandals. Their left hand holds the head of a drought demon. Their right hand holds a blade. They ride a jade dragon. In their modified form, [they display] a blue face with long fangs, a crimson garment and blade, while driving a bear (Kotyk, 2017, p. 62).
Both versions are known from late-Xixia dynasty (1038-1227) art. The first figure takes the form of a lightly clad or even topless woman with long, sometimes unkempt hair and red garments. One painting shows her with a bloody head in her right hand and a sword hanging from her hip (fig. 2). (Though, I should point out that she isn’t always depicted with the head in Xixia or Chinese art (fig. 3 & 4).) The second figure is much rarer and takes the form of a yaksha-like guardian with green skin, a fiery red beard and hair, and red garments. He wields a flaming sword in his right hand and a bloody head in the other (fig. 5). Thank you to Dr. Jeffrey Kotyk for bringing these to my attention.
Fig. 2 – Yuebei as a woman (larger version). Take note of the severed head in her right hand and the sword at her waist. Detail from a 13th to 14th-century Xixia painting in the Hermitage Museum. Fig. 3 – A topless Yuebei wielding only a sword (larger version). Detail from a 13th to 14th-century Xixia painting in the Hermitage Museum. Fig. 4 – Detail of Yuebei from the Chinese Ink Treasure of Wu Daozi (c. 13th-century) (larger version). She too is holding only a sword. Take note of her lunar halo. Fig. 5 – Yuebei as a man (larger version). He clutches a small head in his left hand. Detail from a 13th-century Xixia painting in the Hermitage Museum.
What’s interesting about the yaksha-male Yuebei is that his iconography is strikingly similar to Arabo-Persian depictions of al-Mirrīkh (Mars), who is also known for wielding a sword and head. Dr. Kotyk has directed me to several examples (fig. 6-8). Carboni (Carboni & MET, 1997) suggests that the war god’s imagery is connected to another deity:
The bold iconography of the severed head underscores the warlike character of the planet but it probably is also related to the astronomical image of the constellation of Perseus, called in Arabic ḥāmil ra’s al-ghūl (“the Bearer of the Demon’s Head”), which represents a transformation of the Greek iconography of the severed head of Medusa [fig. 9] (p. 17).
The literary Yuebei’s use of a deadly skull is fitting considering its possible link to the beheaded Gorgon.  Remember that the Secret Practice describes Yuebei’s symbol as that of a “drought demon’s head” (batou, 魃頭), and Arabic sources call Perseus’ symbol the “demon’s head” (ra’s al-ghūl). This shows that both cultures considered the head some kind of supernatural monster.
Fig. 6 – Detail of al-Mirrīkh (Mars) on a late-12th to early-13th century bowl from Central or Northern Iran (larger version). From the Met Museum website. Fig. 7 – Detail from The Wonders of Creation (‘Aja’ib al-Makhluqat wa Ghara’ib al-Mawjudat, 13th-century) (larger version). Found on the Library of Congress website. Fig. 8 – Detail from the Degrees of Truths (Daqa’iq al-haqa’iq, 1272) (larger version). Found on the Bibliothèque nationale de France website. Fig. 9 – The Perseus constellation from the early-11th-century Book of Pictures of the (fixed) Stars (Kitāb Ṣuwar al-kawākib (al-thābitah) (larger version). Found on the Bodleian Library website.
Dr. Kotyk tells me that East Asian depictions of Mars do not show him holding a head. But given the similar iconography of the Arabo-Persian deity and the yaksha-male Yuebei xing, there could be a South Asian intermediary. Bhattacharyya (1958) describes the Indian Buddhist iconography of Maṅgala (Mars) in similar terms: “[He] rides on a Goat. He is red in colour. In the right hand he holds the Kaṭṭāra (cutter) and in the left a severed human head in the act of devouring” (p. 368). But I don’t know how established this description is considering that a cursory search doesn’t turn up any ancient depictions of the Hindo-Buddhist deity holding a head (I’ll update the article if new evidence arises). Another possibility is that the similarities are evidence of cultural exchange between Muslim and Xixia (Tangut) astrologers. Either way, I should point out that the paintings of the yaksha-male Yuebei xing and al-Mirrīkh come from the same time period, the 13th-century.
Recall that Xixia dynasty art (refer back to fig. 2) and the Secret Practice associate the human-female Yuebei xing with the head and sword, showing that it’s not the purview of the yaksha-male figure. It’s interesting to note that both the female figure and Mars are associated with the color red. Kotyk (2017) explains that there is a likely connection between Yuebei xing and the Irano-Semitic Āl–Līlīṯ (a.k.a. Lilith), who is also described as a demoness with a red, naked body and long, unkempt hair (pp. 63-64).
While I’m unsure if there is a connection, Yuebei’s imagery brings to mind the Hindo-Buddhist goddess Chinnamastā–Chinnamunda (Vajrayoginī). She is commonly shown as a naked, red-bodied figure holding a bloody head in one hand and a sword in the other (Kinsley, 1997, p. 144). In this case, the severed head is her own. Her sister attendants are also sometimes shown holding a head and sword (fig. 10).
Beyond art, I learned that the respective astrological paths of Yuebei xing and Mars can cross in East Asian astrology. According to Wan Minying (萬民英), author of the Great Compendium of Astral Studies (Xingxue dacheng, 星學大成, 1563): “If Yuebei and Mars are conjunct in the same sign, [the native’s] heart will enjoy virtue, but they will be unable to actually act. They will also have many noxious sores, and pus and blood 孛火同宮心好善而實不能行亦多癰疽膿血.” 
III. Appearance in other literature
Apart from Journey to the South, Yuebei briefly appears in an earlier Ming-era fiction titled Drama of Yang Jiajiang (Yang Jiajiang yanyi, 楊家將演義, 16th-century). Kotyk (2017) explains that she is depicted as a red-skinned figure “holding in her hand a skeleton (手執骷髏骨)” (p. 63). I should note that the kulou (骷髏) in kulou gu (骷髏骨) can also mean “skull”, which aligns with her iconography.
Recall that the Irano-Semitic demoness Lilith and the Hindo-Buddhist goddess Chinnamastā-Chinnamunda are described or depicted as having red skin. This might explain Yuebei xing’s vermillion body in the novel.
IV. Religious iconography
I know nothing of the actual worship of Yuebei xing, but Ronni Pinsler of the BOXS project was kind enough to show me a pattern sheet of her from an idol-maker’s shop in 1970s Singapore (fig. 11). She wears flowing robes just like her ancient Chinese depictions (refer back to fig. 4), but the signature sword and head are not included. They are instead replaced by a fly-whisk and a placard marked “moon” (yue, 月), which compliments the lunar halo behind her head. Additionally, she is labeled Zhuli fu niang Yuebei tianjun (朱李孚娘 月孛天君). This is similar to the way it’s listed among the 36 celestial generals of the Journey to the North (Beiyou ji, 北遊記, 1602), Zhubei wei Yuebei tianjun (朱孛娘為月孛天君). I also found a more recent religious drawing that appears to mix the feminine and masculine iconography to depict her as an armored general named Taiyi Yuebei xingjun (太一月孛星君) (fig. 12). Both the head and sword are present.
Fig. 11 – The vintage Yuebei pattern sheet from a Singaporean idol shop (larger version). Original photograph by Keith Stevens. Fig. 12 – The Yuebei general image (larger version). It was posted by an Indonesian Daoist priest of the Quanzhen school on Facebook.
Yuebei xing (月孛星, “Moon Comet Star”) briefly appears in chapter 17 of Journey to the South (Nanyouji, 南遊記, 17th-century) as the Monkey King’s monstrous daughter who uses a magic skull weapon to curse a rogue immortal. The demoness is based on a shadowy planetary deity from East Asian astrology that represents the lunar apogee. Xixia dynasty art and the Yuan-Ming Secret Practice scripture depict this deity having two forms, a lightly clad or even topless human-female with red clothing and long, disheveled hair, or a green-skinned, red-bearded yaksha-male. Both of these forms are sometimes depicted wielding a sword and a disembodied head.
The yaksha-male Yuebei xing surprisingly shares iconography with Arabo-Persian depictions of al-Mirrīkh (Mars), who is also represented as a bearded figure wielding a sword and head. Carboni (Carboni & MET, 1997) suggests that the Middle Eastern iconography is related to the constellation of Perseus (a.k.a. “Bearer of the Demon’s Head”) in which he holds the head of Medusa. This is interesting as the head held by the human-female figure is called a “drought demon” in the Secret Practice. This suggests a possible connection between the literary Yuebei xing’s skull and the deadly Gorgon.
Kotyk (2017) notes a possible connection between the human-female Yuebei xing and the Irano-Semitic Lilith. The latter too is described as having a red, naked body and unkempt hair. This same iconography is shared by the Hindo-Buddhist goddess Chinnamastā-Chinnamunda, who is also depicted bearing a sword and (her own) head. This may then explain why Yuebei xing is described as having red skin in the Drama of Yang Jiajiang (16th-century), which predates Journey to the South.
Yuebei xing is worshiped in modern Chinese folk religion. Religious art depicts them as either a robed figure or an armored general. In both cases, the deity is a woman, but only the martial aspect is shown with the head and sword.
Bunce (1994) describes Maṅgala (Mars) just like Bhattacharyya (1958) (refer back to the material below figure 9):
Face: one, angry; arms/hands: two, right hand holds ritual chopper (karttrika, grig-gug), left hand holds severed human head (emphasis added); legs: two; color: red; vahana: goat (p. 328).
But I still haven’t been able to find any ancient drawings of the planetary deity like this.
The iconography of the Hindu goddess Kālī also includes a sword and severed head (fig. 13). I didn’t mention her in the original article because she is traditionally depicted with dark skin, but she likely influenced the red-skinned Chinnamastā-Chinnamunda. It’s important to note that her mythos also associates the head with demons (asuras). For example, the Devī-Māhātmyam (c. 400-600 CE) reads:
Mounting her great lion, the Goddess ran at Caṇḍa, / And having seized him by the hair, she cut off his head with her sword. / On seeing Caṇḍa slain, Muṇḍa rushed at her. / She caused him to fall to the ground, wrathfully smitten with her sword. / On seeing Caṇḍa slain, and also the valorous Muṇḍa, / What was left of the assaulted army was overcome with fear and fled in all directions. / Picking up the heads of Caṇḍa and Muṇḍa, Kali / Approached [Durgā] and spoke words mixed with loud and cruel laughter: / “Here, as a present from me to you, are Caṇḍa and Muṇḍa, two beasts / slain in the sacrifice of battle…” (Coburn, 1991, p. 62).
This adds to our list of sword-wielding, demon head-holding deities: 1) Perseus-Medusa; 2) Yuebei xing-Drought Demon; and 3) Kali-Asura.
I thought of a way for artists and fan fiction writers to mix Yuebei xing’s skull with Medusa’s head. But first recall that section 1 reads:
Yuebei xing then calls Huaguang’s name while holding her own magic treasure, a skull. The immortal is immediately stricken with a headache and stumbles back to his cave in a daze. Her weapon is said to be quite dangerous; anyone whose name is called will die within three days.
Perhaps the skull’s gaze can turn any living thing into stone, but this lithic death happens over the aforementioned three days. After the target’s name is called, the skull’s glowing eyes open wider and wider upon the dawn of each successive day, causing compounding confusion and pain. The final dawn sees the eyes open wide (fig. 14), making the unfortunate soul (no matter their location) turn to stone.
“Who is the mother of Sun Wukong’s children in Journey to the South?” This is a question I’ve been asked a few times on Tumblr. The novel never answers this, but one can make an educated guess for the purposes of fan fiction.
Each child is based on one of three lunar deities appearing among the “Eleven Luminaries” (Shiyi yao, 十一曜) (mentioned above). The specific gods are:
- Jidu (奇都, “Ketu”) = Represents the southern (descending) lunar node, or the point where the moon crosses the earth’s orbit around the sun. Associated with eclipses.
- Luohou (羅睺, “Rahu”) = Represents the northern (ascending) lunar node. Also associated with eclipses.
- Yuebei Xing (月孛星, “Moon Comet Star”) = Represents the lunar apogee, or the furthest point in the moon’s orbit.
Given their close connection to the night time celestial body, it would make sense for the mother to be Taiyin xing (太陰星, “Star of Supreme Yin”), goddess of the moon from the Eleven Luminaries.
Taiyin xing is commonly equated with Chang’e, goddess of the moon in Chinese mythology. The latter briefly appears in Journey to the West as a victim of Zhu Bajie. The former celestial general was exiled from heaven for drunkenly forcing himself on her (Wu & Yu 2012, vol. 1, p. 379).
The goddess’ past connection to Zhu wasn’t lost on me, but I like the way @sketching-shark articulates the potential for comedy (lightly edited):
There’s something hilarious about the idea that Zhu considers his yaoguai-ness a punishment. He was kicked out of heaven for harassing a moon goddess, and then Sun ‘always was & always will be a proud yaoguai.’ Wukong ends up forming a romance with a moon goddess that at least lasted long enough for them to have 3 kids together. Just imagine Sun Wukong: ‘Haha yeah idk she’s a cool lady & we just clicked. I guess Zhu Bajie with teeth clenched & trying hard not to cry: ‘Huh…imagine…that…’ […] Cue Zhu Bajie eating his heart out (see the tags here).
Fig. 15 – A detail of Taiyin xing from the Ink Treasure of Wu Daozi (Daozi mobao, 道子墨寶, c. 13th-century) (larger version). See figure 1 for the complete image. She is the fourth person from the left on the top row.
I’ve decided to make this the only article on my blog where Yuebei xing information can be found. Therefore, I have removed all of it from “The Monkey King’s Children“. This means I have to also transfer some previous updates.
I’ve recently started watching the Lego Monkie Kid series, which follows the adventures of Sun Wukong’s human disciple, MK, in a very toyetic, Lego-inspired world. This is why @TustiLoliPop‘s lovely drawing of Yuebei xing (fig. 16) really stood out to me. They were kind enough to give me permission to post it here. It’s based on the Xixia dynasty painting from figure 2.
Fig. 16 – The Lego Monkie Kid-style Yuebei xing by @TustiLoliPop (larger version). Used with permission.
Tumblr user @sketching-shark has drawn some great pictures of Monkey and his children. Here is one of them (fig. 17). I love the alternating black and white color scheme of Rahu and Ketu, as well as Yuebei xing’s size.
Fig. 17 – Monkey’s family by @sketching-shark (larger version). Used with permission.
1) I’ve already suggested that an acquaintance draw Yuebei wielding Medusa’s head in place of her signature skull. The real question is: Could Medusa’s glare actually kill an immortal? This insightful reddit post provides evidence from the Dionysiaca showing that even the god Dionysus considered it deadly enough to bring a magic diamond to protect himself from the Gorgon’s death stare.
2) Translation by Dr. Kotyk.
Bhattacharyya, B. (1958). The Indian Buddhist Iconography: Mainly Based on the Sādhanamālā and Cognate Tāntric Texts of Rituals (2nd ed.). Calcutta: Firma K.L. Mukhopadhyay.
Bunce, F. W. (1994). An Encyclopaedia of Buddhist Deities, Demigods, Godlings, Saints and Demons: With Special Focus on Iconographic Attributes (Vols.1-2). New Delhi: D.K. Printworld.
Carboni S. & Metropolitan Museum of Art. (1997). Following the Stars: Images of the Zodiac in Islamic Art. New York: Metropolitan Museum of Art.
Coburn, T. B. (1991). Encountering the Goddess: A Translation of the Devī-Māhātmya and a Study of its Interpretation. Albany: State University of New York Press.
Kinsley, D. R. (1997). Tantric Visions of the Divine Feminine: The Ten Mahāvidyās. Berkeley, CA: University of California Press.
Kotyk, J. (2017). Astrological Iconography of Planetary Deities in Tang China. Journal of Chinese Buddhist Studies, 30, 33-88, Retrieved from http://enlight.lib.ntu.edu.tw/FULLTEXT/JR-BJ001/bj001575268.pdf
Yu, X. (n.d.). Nanyouji: Huaguang sanxia Fengdu [Journey to the South: Huaguang goes to the Underworld Three Times]. Retrieved from https://ctext.org/wiki.pl?if=gb&chapter=506975&remap=gb#%E5%8D%8E%E5%85%89%E4%B8%89%E4%B8%8B%E9%85%86%E9%83%BD