- For the object-oriented programming language, see Gello Expression Language.
Gello (Greek: Γελλώ), in Greek mythology, is a female demon or revenant who threatens the reproductive cycle by causing infertility, spontaneous abortion, and infant mortality. By the Byzantine era, the gelloudes (γελλούδες) were considered a class of beings. Women believed to be under demonic possession by gelloudes might stand trial or be subjected to exorcism.
Gyllou, Gylou, Gillo, or Gelu are some of its alternate forms.
- 1 Etymology
- 2 Classical Antiquity
- 3 Byzantine Period
- 4 Middle ages to modern age
- 5 Protections against Gello
- 6 Church attitudes and actions
- 7 Modern folklore
- 8 Modern fiction and popular culture
- 9 List of related demons
- 10 Explanatory notes
- 11 References
Gello possibliy derives from Gallû, a Babylonian–Assyrian demon believed to bring sickness and death. The theory was advanced by Carl Frank (1881–1945) and supported by M.L. West, Walter Burkert, and others. The name is also preserved in the later word ghoul.
Greek folk etymology links the word to the root gel-, "grin, laugh," in the sense of mocking or grimacing, like the expression often found on the face of the Gorgon, to which Barb linked the reproductive demons in origin. Such demons are often associated with or said to come from the sea, and demonologies identify Gyllou with Abyzou, whose name is related to abyssos, the abyss or "deep."
According to ancient myth, Gello was a young woman who died a virgin, and returned as a ghost (Greek: φάντασμα, phantasma) to do harm to the children of others. The myth is given as an explanation to a proverb by the 2nd-century compiler Zenobius. It is noted that Sappho mentioned her, implying that Gello was a feared bane of children at least as far back as the 6th century BC.[a]
The lexicographer Hesychius who wrote in the 5th or 6th century AD but drew from earlier lexicons glossed Gello (Greek: Γελλώ) as a ghost (eidolon) who attacked both virgins and newborn babies.
Gello, Lamia, and Mormo due to their similar nature, have often been confounded since the Early Middle Ages. Each of these three originated as a single individual woman (with her own origin myth or aition) in Ancient Greece, but later developed into a type of frightening apparitions or demons, as noted by modern commentators.[b]
The gello eventually came to be regarded as a type of being, rather than an individual. The plural form gelloudes (γελοῦδες), not found in Ancient Greek, came into existence in the Byzantine period, and used in the 7th–8th century by the patriarch John of Damascus, in his treatise peri Stryggōn (περί Στρυγγῶν, "Regarding striges"). The gelloudes were considered synonymous to the stryggai (Greek: στρίγγαι, Στρῦγγαι) or "witches" by him, and described as beings that flew nocturnally, slipped unhindered into houses even when windows and doors were barred, and strangled infants.
The polymath Michael Psellos of the 11th century inherited the notion that the stryggai and gelloudes were "interchangeable". He described them as beings that "suck blood and devour all the vital fluids which are in the little infant". Psellus documents a widened scope of the Gello's victims in the beliefs of the 11th century. Gello were being held responsible for the deaths of pregnant women and their fetuses as well. Gello (or Gillo) was also blamed for the condition of newborn infants who wasted away, and such infants were called Gillobrota (Γιλλόβρωτα), according to Psellus.
Psellus sought in vain for Ancient Greek sources of these beliefs, and formulated the theory that the gello derived from the Hebrew Lilth. Psellus further stated that the name "Gillo" could not be discovered in his usual sources for demonic names in antiquity, but were to be found in an esoteric or "occult" (ἀπόκρυφος) Hebrew book ascribed to Solomon. Later, the 17th-century Greek Catholic scholar Leo Allatios would criticize Psellos's confounding of the gello and Lilith.
Middle ages to modern age
Aspects of the superstitions about the gelloude may be followed from the Middle Ages from various writings and talismans, to a treatise written by Leo Allatius in the 17th century which reveal that the medieval beliefs were still held and practiced by the populace.
Corporeal and phantom forms
Although reports of Gello's behavior are consistent, her nature is less determinate. In the 7-8th century, John of Damascus equated the gello with the stryggai that sometimes appeared in spirit form while at other times had solid bodies and wore clothing.
The strix could be regarded an "unclean spirit" (akátharton pneuma) subject to demonic excorcism, according to an exorcism text recorded by 17th century writer Allatius. A woman could also be regarded as being a gello by the populace, but the charges were dismissed in an ecclesiastical trial c. 8th century. The orthodox theology of the Church, expounded by Psellos or Ignatius, held that a woman's gendered nature precluded her from turning into a demon, since a demon was officially considered sexless. Johnston prefers to use the Greek word aōros or aōrē, "untimely dead"[c] for this form of transgressive or liminal soul or entity, finding the usual phrase "child-killing demon" to be misleading.
From virgin to witch-hags
It has been pointed out by modern commentators that even though the original Gello was a young woman who died a virgin, the gelloudes which became synonymous with stryggai or "witches" in the Christian era, were generally regarded as being old envious crones.
Equating gelloudes with the striggai, which occurred by the 7th–8th century with John of Damascus as already noted, still continued in the times of the 17th century Leo Allatius who said that Striges (in the sense of "witches") was also called Gellones (Latinized form) according to popular belief. Allatius also recorded many variant forms, such as gelu, gello, gillo (in the singular). Leo Allatius wrote that the people who were his contemporaries in Greece were already entrenched in the belief that these witches were generally old crones who contracted with the devil. This, it has been argued, was a transplantion of the image of witch of Western Europe onto the Greek idea of gelloudes.
Protections against Gello
In the Byzantine period, mothers who had given birth customarily relied on amulets designed to protect her newborn from evil, including the Gello or Gyllou. The woman was a rare exception who would shun these charms and invest her faith entirely on the power of the Cross.
Leo Allatios in the 17th century would criticize such remnants of sorcery such as these charms, or the hanging of red coral or a head of garlic, and prescribed strictly Christian prophylactics, such as a cross or image of Christ placed by a child's bed to ward off Gello or demons in general, or burning lamps to illuminate sacred images. The practice of baptizing infants was thought to offer protection against demon-snatching, and specifically against the gello, according to Leo Allatios.
The magico-medical compilation Cyranides from the Imperial period provided instructions on how to defend against the gelloudes. The eyeballs of a hyena in a purple pouch was said to be an effective amulet against "all nocturnal terrors, also Gello, who strangles infants and troubles women in childbed". Using an ass's skin as a bedsheet to sleep on was also prescribed as effective against the Gello.
The Lithica of the late Hellenistic to early Imperial Period listed magical stones as effective charms as well, although they do not explicitly mention gello either. However, in these texts, galactite is said to protect against either Megaira ("Envy"), or "frightful woman" (horrida mulier) who attacked infants.[d]
Early Byzantine amulets
Some Byzantine amulets against female reproductive demons are said to depict the Gello. This is sometimes asserted as a rule of thumb, without providing reasoning. As no Byzantine amulet exists that actually labels the demon as a Gello or Gyllou, the inference is made these are Gello by association with other figures labeled in the amulets, namely the demon Abyzou, the Saint Sisinnios, or the Evil Eye of "Envy".
Numerous early Byzantine amulets (6th to 7th century label its demon as "Abyzou"  identifiable with Obyzouth, a demon that strangles newborns according to the 1st to 3rd century Greek text called the Testament of Solomon. This Abyzou (Obyzouth) has been equated with the Gello (Gyllou), albeit in later literature, for example, the writings of Michael Psellos of the 11th century.
Some Byzantine amulets[e] also invoke the name of Saint Sisinnios, who is known foremost as the vanquisher of Gello. Again, the textual evidence that connect Sissinios to Gylou are from much later dates,[f] the oldest version of the "Melitine charm" or Legend of St. Sisinnios dating to the 15th century.
A concrete example is the Schlumberger No. 1 amulet shown on the right.[g][h] Several scholars have hinted that the she-demon here, which has been noticed to have fish- or serpent-like attributes below the waist, may refer to Gello-Gyllou. The demon is being stabbed with a lance by a mounted figure (sometimes called the "holy rider" or "rider saint") which may be St. Sisinnios or Solomon.[i] The inscription reads "Flee, detested one, Solomon, Sisinnios and Sisinnarios pursue you".
The same amulet has a second side, which depicts an eye as "Envy" (phthonos, φθόνος), attacked by weapons and animals.  One of the commentator has specifically connect the Evil Eye of Envy with the Gylou, while the others connect it more vaguely to the child-stealing demon or say that the beings labeled "Envy" are the ghost-demons (aōrē).
Envy and Evil eye
Gello or Gylou's curse has been associated with the Evil eye of Envy at least since the Byzantine period, according to commentators.[j] Sarah Iles Johnston views the Phtonos eye on the amulet and the Megaira (the Envious One) invoked in the entry for "galactite" in one Lithica (book of stones), as not just a personfification of "Envy" but an aōrē (ghost demons) in their own rights, and insinuates that these charms are meant to apply to one of her specific aōrē, the Lamia, the Gello, or the Mormo. She fortifies her thesis that these aōrē were regarded as envious by pointing to Greek grave-markers that blame "envious demons" for robbing a young child of its life.
Legend of Saint Sisinnios
The story of St. Sisinnios assisting his sister Melitene against the demon Gyllou occurs in a group of different texts (These are also the texts in which Gyllou is compelled to reveal its "twelve and a half names"). These have been variously referred to as the "historiola" where in "the Greek tradition the woman is usually called Melitene",Spier (1993), p. 36 or "Melitine charm", or "Melitene type of Gylou story", or gello exorcism texts. The text group has been analyzed by Richard P. H. Greenfield in 1989, with the oldest example from a 15th cenuty manuscript. The text group has been analyzed by Richard P. H. Greenfield in 1989.
In the 15th century manuscript version, the tale is set in the time of "Trajan the King". After losing six children to the Gyllou, Melitene gives birth to a seventh child inside a fortification she built at Chalcopratia (a part of the Constantinople). When her brothers, Sisinnios, Sines, and Sinodoros demand admittance, the "filthy" Gyllou[k] gains entry by transforming into a fly clinging to the horse, and kills the child. The saints pray and an angel appears who instructs them to pursue the Gyllou to Lebanon. The Saints compel the demon to bring back to life all of Melitene's children, which the demon accomplishes after obtaining the mother's milk from Melitene. The saints continue to beat Gyllou, who begs mercy in return for revealing that she could be kept away with a charm inscribed with the names of the saints and with all of her different names. Then she proceeds to divulge her "twelve and a half names":
|“||My first and special name is called Gyllou; the second Amorphous; the third Abyzou; the fourth Karkhous; the fifth Brianê; the sixth Bardellous; the seventh Aigyptianê; the eighth Barna; the ninth Kharkhanistrea; the tenth Adikia; (…)[l] the twelfth Myia; the half Petomene.||”|
The names of Gello
Knowledge of a demon's name was required to control or compel it; a demon could act under an alias. Redundant naming is characteristic of magic charms, "stressing," as A.A. Barb noted in his classic essay "Antaura", "the well-known magic rule that the omission of a single one can give the demons a loophole through which they can work their harm."
In the aforementioned Leo Allatius version of the Legend of St. Sisinnos, the twelve-and-a-half names are given as Gylo, Morrha, Byzo, Marmaro, Petasia, Pelagia, Bordona, Apleto, Chomodracaena, Anabardalaea,[n] Psychoanaspastria, Paedopniktria, and Strigla.[o] Although magic words (voces magicae) have often been corrupted in transmission or deliberately exoticized, several of these names suggest recognizable Greek elements and can be deciphered as functional epithets: Petasia, "she who strikes"; Apleto, "boundless, limitless"; Paedopniktria, "child suffocator." Byzo is a form of Abyzou, abyssos, "the Deep," to which Pelagia ("she of the sea") is equivalent.
The names of Gylo also include Chomodracaena, containing drakaina, "female dragon." In one text dealing with the gello, she is banished to the mountains to drink the blood of the drako; in another, she becomes a drako and in this form attacks human beings. In other texts, the child itself is addressed as Abouzin (Abyzou).
Legend of Saint Michael
|“||The archangel Michael said to her, 'Where have you come from and where are you going?' The abominable one answered and said, 'I am going off to a house and, entering it like a snake, like a dragon, or like some reptile, I will destroy the animals. I am going to strike down women; I will make their hearts ache, I will dry up their milk … I will strangle [their] children, or I will let them live for a while and then kill them' … .||”|
Although the name Gylou is not found on any surviving amulets, Michael is the adversary Gylou encounters most often in medieval Byzantine texts.
Parallels to the lore of child-skilling demon forced to confess its secret names occur as historiola or folktales surrounding magic spells, in medieval manuscripts of many languages, including Greek, Coptic, Ethiopian, Armenian, Romanian, Slavonic, Arabic, Syriac, and Hebrew.
The earliest examples, dating to the 5th or 6th century are the Aramaic versions of the historiola found as long inscriptions on objects: a silver lamella (metal-leaf sheet) from Palestine and two incantation bowls. In these Aramaic examples, the demon bears the name Sdrws (or Sideros, which in Greek would mean "iron"), and the female victim whose twelve sons are taken is called Smamit ("lizard" or "spider"). This reading is considered to be corroborated by the name of the female demon in the Ethiopian version, Werzelya, which also means "iron". The Ethiopian tradition explains that Werzelya was the evil sister of the Saint Sūsenyōs (which Budge identifies as Sisinnios), and the saint sought out to kill her.
Church attitudes and actions
In his Life of Tarasius, Ignatius the Deacon of the 9th century recounts an actual case in which two women were charged as gelloudes and brought before Saint Tarasius's father, who acquitted them.
The psychological aspects of Gello were observed also by Leo Allatios in his work De Graecorum hodie quorundam opinionibus ("On the beliefs of the Greeks today"). Textual sources he collected on the Gello included Sappho's poem, the Suda, exorcisms, a church history, the Life of Patriarch Tarasios of Constantinople written by Ignatius the Deacon, and proverbs. Allatios's purpose was to demonstrate the continuity of customs and morals, but also to show that these beliefs distorted or ran contrary to Christian doctrine. Sometimes the acts characteristic of Gello were attributed to "poor and miserable old crones," who could be accused in court as gelloudes and might even claim or confess to have acted as such.
A different Penance was prescribed gelloudes, distinguished from infanticides in the Nomocanons of the 17th century theologian Jean-Baptiste Cotelier. Michael Psellos, however, rejected the notion that human beings could transform into demonic beings, and so there would be no need for a particular penance; the official position of Orthodoxy was that such creatures did not exist.
Despite her official non-existence, the gello is named in exorcisms, which required the attendance of a priest, and in prayer formularies. The Virgin Mary is invoked against the child-harming demon gylo:
|“||Therefore I pray, my Lady, for your swiftest aid, so that the children of these your servants N and N may grow up,[p] and that they may live and give thanks in the sight of the Lord for all the days of their lives. Thus let it be, my Lady. Listen to me, a sinner and unworthy servant and although I am a sinner, do not despise my poor and miserable prayer but protect the children of your servants and let them live and send the Angel of Light so that he may protect and defend them from all evil, from wicked spirits, and from fiends which are in the air, and do not let them be singled out by other <demons> and by the accursed gylo lest harm comes to them and their children.||”|
In one exorcism of the gello, no fewer than 36 saints are invoked by name along with Mary and the "318 Saints of the Fathers", with a final addendum of "all the saints." Some prayers resemble magic spells in attempting to command or compel the saints, rather than humbly requesting aid. Exorcisms emphasize that Christian families deserve exclusive protection. Gello continued to be named in exorcisms into the 20th century.
The old church regarded childbirth involving blood as unpure, and a newborn had to wait to be baptized for several days, and the mother could not rejoin the community for much longer. The child was considered at greater risk in the birth mother's sphere of influence at this time, as she would attract the female demons seeking blood.
In the story of Melitene, sister of the saints Sisinnios and Sisynodorus, the child is in peril until it is "returned" to the hands of men. In one version, the gello swallows the child and must be forced by the male saints to regurgitate it alive. This cycle — death by swallowing, regurgitation, new life — may be symbolized in initiation ceremonies such as baptism, which marked the separation of the child from the taint of its mother's gello-attracting blood.
One exorcism text dating from around the turn of the 19th–20th century gives Baskania as a name for the gello as well as for the evil eye.
Modern fiction and popular culture
- Gyllou is featured in a major text of modern Luciferianism, a belief system that venerates Lucifer. In The Bible of the Adversary by Michael W. Ford, she is associated with Lilith and represents Vampyrism as a desire for eternal life.
- Gello (here spelled "Gilou") is the primary antagonist of Jessie D. Eaker's short story The Name of the Demoness, featured in the sixth Sword and Sorceress anthology. She appears as a dog-headed woman with snakes for fingers who steals newborn babies, and her many names are a major plot point.
- The "gylou" or "handmaiden devil" is an all-female species of devil in the Pathfinder Roleplaying Game. They are also known as "Maids of Miscarriage" and are noted to particularly hate babies.
Scholarly discussions of Gello associate her with and analyze the meaning of her narrative traditions in relation to the following demons and supernatural beings:
- In fact, the proverb, "Fonder of children than Gello" is generally considered a fragment of Sappho's poem.
- Sarah Iles Johnston employs the phrase "reproductive demons" for the three beings.
- aōros being a term employed by Zenobius and Hesychius.
- The eagle-stone or aetites were originally used as an amulet to prevent miscarriage and promote healthy delivery, but later, they were considered effective protecting against delirium and night terrors, associated with Gello and other demons. The Latin text terroribus nefandis is rendered "unspeakable terrors" elsewhere.
- Either with or without labeling the demon.
- The text group has been analyzed by Richard P. H. Greenfield in 1989. These texts are variously referred to: as "historiola" where in "the Greek tradition the woman is usually called Melitene",Spier (1993), p. 36 or "Melitine charm", or "Melitene type of Gylou story", or gello exorcism texts,.
- Currently held at Paris, Cabinet des Médailles, shelfmark Schlumberger 68.
- It becomes clearer the same amulet is being talked about by different commentators (Johnston (2013), p. 193, note 91, Hartnup (2004), pp. 146–147, note 65) by noticing that they cite Paul Perdrizet or Schlumberger pp. 74–75.
- Commentators do not necessarily commit to an identification of the rider here, and give a general discussion that the rider is most often Solomon, but that there are other specimen where the rider is Sissinios.
- Phthonos (Envy) is given as the name of the demon who is the caster of the evil glance, against which the amulet depicting the "suffering eye" is confessed to be effective, according to the Testament of Solomon.
- "μιαρά Γυλλοῦ"
- There is a lacuna in the original text.
- This version is cited by Perdrizet (1922), pp. 19 as text c, which Perdrizet counts as one of five texts of the "twelve and a half names" he is aware of.</ref>
- Anabardalaea is also given as a name of Abyzou on a Byzantine amulet; Spier (1993), p. 30.</ref>
- The names are transliterated as Gylou, Morra, Byzou, Marmarou, Petasia, Pelagia, Bordona, Apletou, Chamodrakaina, Anabardalaia, Psychanospastria, Paidopniktria and Strigla in Ryan, William Francis (1999), , Penn State Press, p. 246.
- "N" in ancient and medieval prayers and magic spells stands for nomen, "name"; here the parents' names would be inserted.
- West, M.L. (2003 ), The East Face of Helicon: West Asiatic Elements in Greek Poetry and Myth, Oxford: Clarendon Press, pp. 58–59 and 531.
- Römer, W.H.Ph. (1969), "The Religion of Ancient Mesopotamia", in Historia Religionum: Religions of the Past, Brill, p. 182
- Frank, C. (1910) "Zu babylonischen Beschwörungstexten" Zeitschrift für Assyriologie 24 p. 161ff, "Nachtrag" 333f, cited by West, M. L. (2003) pp. 58–59 and by Römer, W.H.Ph. (1969), p.182.
- Burkert, Walter (1992), The Orientalizing Revolution: Near Eastern Influence on Greek Culture in the Early Archaic Age, Harvard University Press, pp. 82–87, citing Frank, C. (1910).
- Barb (1966), p. 5.
- Barb (1966), "Antaura," passim, and Burkert (1992), p. 82 ("evil grinning").
- For Barb's etymology of Abyzou and the connection to the primeval sea, see Abyzou: Origins.
- "‘Fonder of children than Gello’ is a saying applied to women who die prematurely (aōros), or to those fond of children who ruin them with their upbringing. For Gello was a maiden (parthenos) who died prematurely (aōros), and as the people of Lesbos say, her ghost (phāntasma) haunts little children and she is to blame for occurrences of premature deaths (aōron). Sappho mentions her". (translated after Johnston (2013), Restless Dead, p. 173 (adapted from the Loeb Classical Library edition), and Barnstone (2009), p. 181.
- Zenobius, Proverbs 3.3 (in Greek with notes in Latin).
- Johnston (2013).
- "Γελλώ παιδοφιλοτέρα (Gello paidophilotera. [She is] [even] fonder of children than Gello)". Sappho, frg. 178 in Poeta Lesbiorum fragmenta, edited by Edgar Lobel and Denys Page (Oxford 1955), p. 101; translated Barnstone (2009), p. 20. Also explained in Hartnup (2004), pp. 35, 85–86, 149–150.
- Johnston (2013) p. 166
- Hesychius (of Alexandria) (1858). Alberti, Johann; Schmidt, Moritz; Menge, Rudolf, eds. Hesychios: Hesychii alexandrini Lexicon post Ioannem Albertum. 1. sumptibus F. Maukii. p. 421.
Γελ(λ)ώ : είδωλον Ἔμπούσης το τών ἀώρων, τών παρθένων
- Lawson (1910), p. 173.
- Johnston (2013), p. 164.
- Johnston (2013), p. viii.
- Lawson (1910), p. 178.
- John of Damascus, Peri strygnōn I, p. 143 (περί Στρυγγῶν), Migne ed., Patrologia Graeca xciv, p. 1604, quoted in translation, and cited in Lawson (1910), pp. 178, 181
- Hartnup (2004), pp. 85–86.
- Psellos in Leo Allatios, De Graecorum hodie quorundam opinationibus epistola (1643), §3, cited by Johnston (1995), p. 366: "The Byzantine scholar Michael Psellus reports that in his day, Gello was credited with killing pregnant women and/or their fetuses as well as infants (ap. Leo Ailatius.. ".
- Lawson (1910), citing Michael Psellus.
- Michael Psellos, Philosophica minora , O'Meara, D., ed. (1989), vol. 1, p. 164, lines 1–20, cited by Hartnup (2004), p. 149
- The Testament of Solomon?
- Michael Psellos, Philosophica minora, O'Meara, D., ed. (1989), vol. 1, p. 164, as cited by Magdalino, Paul; Mavroudi, Maria (2006)The Occult Sciences in Byzantium, p. 15.
- Hartnup (2004), pp. 158.
- Nikephoros Kallistos Xanthopoulos, Ecclesiasticae historiae, in PG 147, cols. 345–348, as cited by Hartnup (2004), p. 87.
- John of Damascus, I, p. 473, in Migne, Patrologia Graeca, p. 1604. Cited by Lawson (1910), pp. 144, 181
- Leo Allatius, second text of gello exorcism, cited by Hartnup (2004), pp. 87–88. Cf. p. 39
- Ignatius the Deacon, Ignatius the Deacon, cited by Hartnup (2004), pp. 88 and 93.
- Hartnup (2004), pp. 88 and 91ff.
- Johnston (1995), p. 369.
- Johnston (2013), pp. 162–166.
- Johnston, Sarah Iles (1997), "Corinthian Medea and th Cult of Hera Akraia," in Medea: Essays on Medea in Myth, Literature, Philosophy, and Art, Princeton University Press, p. 58.
- Allatius, quoted in translation in Lawson (1910), p. 178
- Leo Allatius, De opinationibus, III, p. 116, cited by Hartnup (2004), pp. 158–159
- Leo Allatius, De opinationibus, II, p. 115, quoted in translation by Hartnup (2004), pp. 159, 149
- Hartnup (2004), p. 160.
- Hatlie, Peter (2010 ) "The Religious Lives of Children and Adolescents" in: Krueger ed., Byzantine Christianity, Fortress Press, p. 184
- Hartnup (2004), pp. 95–96
- Ingemark, Camilla Asplund; Ingemark, Dominic (2013), Verheyk, Hendrik, ed., "More than Scapegoating: the Therapeutic Potential of Stories of Child-Killing Demons in Ancient Greece and Rome", Therapeutic Uses of Storytelling, Nordic Academic Press, pp. 76–77
- Cyranides 2.40.35–38, cited by Ingemark & Ingemark (2013), p. 76
- Cyranides 2.31.20–23, cited by Ingemark & Ingemark (2013), p. 76
- Orphei Lithica 224–225, cited by Johnston (2013)
- Damigeron-Evax Lithica 34.23, cited by Johnston (2013) 164, 167
- Johnston (2013), pp. 166–167.
- Ingemark, Camilla Asplund, ed. (2013), The Prodromus of Nicolaus Steno's Dissertation, p. 224, note 1
- Bonner, Campbell (1950), Studies in magical amulets: chiefly Graeco-Egyptian, University of Michigan Press, p. 210,
in Byzantine times the evil creature is Gyllou, or Gyllo, the destroyer of little children, and Sisinnius is the deliverer., cited by Fulghum (2001), p. 142.
- Spier (1993), p. 37.
- Spier (1993), p. 31 and Appendix II.
- Spier (1993), pp. 37–38.
- Spier (1993), pp. 33–35.
- There is one unique example of an amulet labeled "Abyzou" from the later, medieval Byzantine period. It is the specimen held by the Ashmolean Museum in Oxford.Spier (1993), p. 38.
- Hartnup (2004), p. 147: "The two demons gello and Obyzouth were identified.. by Michael Psellos. More recently, Greenfield's analysis of the gello′s names has suggested that Obyzouth is a form of Abyzou".
- Johnston (2013), 193, note 91.
- Spier (1993), pp. 36–37.
- Björklund (2017), pp. 22–23.
- Greenfield (1988), p. 274.
- Hartnup (2004), p. 86 and note 13.
- Björklund (2017), pp. 22–23}, citing Greenfield (1989)
- "Historia execrandae et impurae Gyllus", Paris manuscript, Bibliotheque Nationale, fonds grec 395, fol. 12–, ca. 1450–1550. Or Apostrophe seu narratio de impura Gyllone (BHG, 2403), published by Sathas, K.N. (1876),Μεσαιωνικὴ Βιβλιοθήκη 5, p. 573. Quoted in Greek and translated into French as Legenda S. Sisinnii [Légendes de Saint Sisinnios, Legend of St. Sisinnios], in Perdrizet (1922), pp. 16–19 and designated as text "a". Partial English translation given in Naveh & Shaked (1985), pp. 114–115.
- Cite error: The named reference
meltitene-allatiuswas invoked but never defined (see the help page).
- It tells of a story of a It is a story of a woman named Melitene persecuted by the child-robbing Gyllou and assited by her brother St. Sisinnios. These will be discussed below, under §Legend of Saint Sisinnios
- Schlumberger, Auguste (1892) "Amulettes byzantins anciens, destinés à combattre les maléfices et maladies",Revue des études grecques pp. 74–75, cited by Perdrizet (1922), p. 27
- Spier (1993), p. 61, note 162.
- Hartnup (2004), pp. 146–147.
- Spier (1993), p. 33, 37
- Hartnup (2004), p. 147.
- Fulghum, Mary Margaret (2001), "Coins Used as Amulets in Late Antiquity", Between Magic and Religion: Interdisciplinary Studies in Ancient Mediterranean Religion and Society, Rowman & Littlefield, pp. 142–143
- Greek text: "φεῦγε μεμισιμένι Σολομόν σε διόκι Σισίννιος Σισιννάριος".
- Björklund (2017), p. 51.
- Fulghum (2001), p. 146: "The Evil Eye of Envy, generally related to the curse that the demon Gylou cast upon her victims.
- Johnston (2013), p. 193.
- Testament of Solomon 4.2, citing McCown (1922), p. 18. Fulghum (2001), p. 143
- Greenfield (1989), pp. 83–141, cited by Spier (1993), p. 36, Björklund (2017), pp. 22–23, Hartnup (2004), p. 86 and note 13, etc.
- Greenfield (1989), pp. 83–141 cited by Björklund (2017), pp. 22–23
- Johnston (2013), p. 209.
- Leo Allatius, De opinationibus, VII, p. 135, quoted in English translation piecewise in Hartnup (2004), pp. 87, 98; the full tale is also translated in Argenti, Philip P.; Rose, H.J. (1949), The Folk-Lore of Chios, Cambridge University, pp. 42–45.
- Barb (1966), p. 4.
- Extensive discussion on the power of naming in Hartnup, Karen (2004) On the Beliefs of the Greeks: Leo Allatios and Popular Orthodoxy, Brill, pp. 97–101
- Voces magicae, including the naming of supernatural beings, are discussed at length by William M. Brashear, “The Greek Magical Papyri: 'Voces Magicae',” Aufstieg und Niedergang der römischen Welt II, 18.5 (1995), pp. 3422–3438, limited preview 
- Hartnup (2004), pp. 99–100.
- Hartnup (2004), pp. 116–117, especially for citations on the drako.
- Björklund (2017), p. 23.
- Translation by Greenfield (1988), p. 184 and note 558, quoted in Spier (1993), p. 35 and note 54. The original text is Bibliothèque Nationale, MS fonds gréc 2316, fols. 432r–433r, as given by Spier (1993) note 52.
- Spier (1993), p. 37, note 67; there may be a discrepancy between this assertion and Johnston's claim that Sisinnius is the regular adversary of Gello.
- Spier (1993), p. 36.
- Naveh & Shaked (1985) AMB, Amulet 15
- Naveh & Shaked (1985) AMB, Bowl 12a, Jewish National and University Library 4° 6079 and 12b, Metropolitan Museum, No. 86.11.259.
- Budge, E. Wallis (2014), A History of Ethiopia: Volume II, p. 528
- Suidae Lexicon, edited by Ada Adler (Leipzig 1928), vol. 1, p. 512, no. 112.
- Hartnup (2004), p. 85.
- Cotelier, Jean-Baptiste, cited by Hartnup (2004), p. 88
- Hartnup (2004), pp. 89–91.
- Hartnup (2004), p. 97, citing Allatios, De opinionibus VII, p. 132.
- For a full list, see Hartnup (2004), p. 102
- Hartnup (2004), p. 103.
- Hartnup (2004), p. 108.
- Hartnup (2004), p. 122.
- Hartnup (2004), pp. 129–130.
- Johnston (2013), p. 166.
- Hartnup (2004), p. 148, note 71.
- Michael Ford, The Bible of the Adversary (Lulu.com, 2008), pp. 110–111 online.
- Jessie D. Eaker, The Name of the Demoness excerpt.
- Pathfinder Roleplaying Game: Bestiary 2 product discussion at Paizo.com.
- Barb, A.A. (1966). "Antaura. The Mermaid and the Devil's Grandmother: A Lecture". Journal of the Warburg and Courtauld Institutes. 29: 1–23. JSTOR 284396
- Barnstone, Willis (2009). Of Gello Who Died Young, Whose Ghost Haunts Little Chidren. The Complete Poems of Sappho. Shambhala Publications. pp. 20, 181.; also Ancient Greek Lyrics (2010), Indiana University, pp. 50, 317.
- Björklund, Heta (2017). Protecting Against Child-Killing Demons: Uterus Amulets in the Late Antique and Byzantine Magical World (PDF) (Thesis). University of Helsinki.
- Greenfield, Richard P.H. (1988). Traditions of Belief in Late Byzantine Demonology. Amsterdam. pp. 182ff.
- Greenfield, Richard P.H. (1989). "Saint Sisinnios, the Archangel Michael and the Female Demon Gylou: the Typology of the Greek Literary Stories". Βυζαντινά Byzantina: 83–142.
- Hartnup, Karen (2004). On the Beliefs of the Greeks: Leo Allatios and Popular Orthodoxy. Ancient Magic and Ritual Power. Brill. Chapters 4–6.
- Johnston, Sarah Iles (1995). Meyer, Marvin W.; Mirecki, Paul Allan, eds. "Defining the Dreadful: Remarks on the Greek Child-Killing Demon". Ancient Magic and Ritual Power. E.J. Brill: 361–387. ISBN 9-789-0041-0406-8
- Johnston, Sarah Iles (2013). Restless Dead: Encounters Between the Living and the Dead in Ancient Greece. Univ of California Press. p. 174. ISBN 9-780-5202-8018-2
- Lawson, John Cuthbert (1910). The Poetry of Criticism: Horace, Epistles II and Ars Poetica. Cambridge University Press. pp. 176–179.
- Naveh, Joseph; Shaked, Shaul (1985). Amulets and Magic Bowls: Aramaic Incantations of Late Antiquity. Ancient Magic and Ritual Power. Jerusalem: Magnes Press. pp. 104–122, 189–197.
- Perdrizet, Paul (1922), Negotium Perambulans in Tenebris, études de démonologie gréco-orientale, Lib. Istra
- Spier, Jeffrey (1993). "Medieval Byzantine Magical Amulets and Their Tradition" (PDF). Journal of the Warburg and Courtauld Institutes. 56: 25–62. Archived from the original (PDF) on 2009-08-24. JSTOR 751363