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The word cynocephaly is taken (through Latin) from the Greek word κῠνοκέφᾰλοι kynokephaloi, from kyno– (combining form of κύων kyōn) meaning "dog" and κεφαλή kephalē meaning "head".
Ancient Greece and Egypt
Cynocephaly was familiar to the Ancient Greeks from representations of the Egyptian gods, Duamutef (Son of Horus), Wepwawet (The opener of the ways), and Anubis (the Egyptian god of the dead). The Greek word (Greek: κῠνοκέφᾰλοι) "dog-head" also identified a sacred Egyptian baboon with the face of a dog.
Reports of dog-headed races can also be traced back to Greek antiquity. In the fifth century BC, the Greek physician Ctesias wrote a detailed report on the existence of cynocephali in India, known as Indica. Similarly, the Greek traveller Megasthenes claimed to know about dog-headed people in India who lived in the mountains, communicated through barking, wore the skins of wild animals and lived by hunting. Herodotus reports claims by ancient Libyans that such creatures inhabit the east of their lands, as well as headless men and various other anomalies.
The best estimate for the place where the battle between the Argonauts and the Cynocephali took place is modern day North Serbia, or South Hungary. 
The cynocephali offered such an evocative image of the magic and brutality deemed characteristic of bizarre people of distant places that they kept returning in medieval literature. Augustine of Hippo mentioned the cynocephali in City of God, Book XVI, Chapter 8, in the context of discussing whether such beings were descendants of Adam; he considered the possibility that they might not exist at all, or might not be human (which Augustine defines as being a mortal and rational animal: homo, id est animal rationale mortale), but insisted that if they were human they were indeed descendants of Adam.
Cynocephali also figure in medieval Christian world-views. A legend that placed St. Andrew and St. Bartholomew among the Parthians presented the case of "Abominable", the citizen of the "city of cannibals... whose face was like unto that of a dog." After receiving baptism, however, he was released from his doggish aspect.
In the Eastern Orthodox Church, certain icons covertly identify Saint Christopher with the head of a dog. The background to the dog-headed Christopher is laid in the reign of the Emperor Diocletian, when a man named Reprebus, Rebrebus or Reprobus (the "reprobate" or "scoundrel") was captured in combat against tribes dwelling to the west of Egypt in Cyrenaica. To the unit of soldiers, according to the hagiographic narrative, was assigned the name numerus Marmaritarum or "Unit of the Marmaritae", which suggests an otherwise-unidentified "Marmaritae" (perhaps the same as the Marmaricae Berber tribe of Cyrenaica). He was reported to be of enormous size, with the head of a dog instead of a man, apparently a characteristic of the Marmaritae. This Byzantine depiction of St. Christopher as dog-headed resulted from their misinterpretation of the Latin term Cananeus (Canaanite) to read canineus, that is, "canine". The German bishop and poet Walter of Speyer portrayed St. Christopher as a giant of a cynocephalic species in the land of the Chananeans (Canaan in the New Testament) who ate human flesh and barked. Eventually, Christopher met the Christ child, regretted his former behavior, and received baptism. He, too, was rewarded with a human appearance, whereupon he devoted his life to Christian service and became an athlete of God, one of the soldier-saints. There are some rare icons that depict this martyr with the head of a dog. Such images may carry echoes of the Egyptian dog-headed god, Anubis; and Christopher pictured with a dog's head is not generally supported by the Orthodox Church.
Paul the Deacon mentions cynocephali in his Historia gentis Langobardorum: "They pretend that they have in their camps Cynocephali, that is, men with dogs' heads. They spread the rumor among the enemy that these men wage war obstinately, drink human blood and quaff their own gore if they cannot reach the foe." At the court of Charlemagne the Norse were given this attribution, implying un-Christian and less-than-human qualities: "I am greatly saddened" said the King of the Franks, in Notker's Life, "that I have not been thought worthy to let my Christian hand sport with these dog-heads." The ninth-century Frankish theologian Ratramnus wrote a letter, the Epistola de Cynocephalis, on whether the Cynocephali should be considered human (he thought that they were). If human, a Christian's duty would be to preach the Gospels to them. If animals, and thus without souls, such would be pointless. Quoting St. Jerome, Thomas of Cantimpré corroborated the existence of Cynocephali in his Liber de Monstruosis Hominibus Orientis, xiv, ("Book of Monstrous men of the Orient"). The thirteenth-century encyclopedist Vincent of Beauvais acquainted his patron Saint Louis IX of France with "an animal with the head of the dog but with all other members of human appearance… Though he behaves like a man… and, when peaceful, he is tender like a man, when furious, he becomes cruel and retaliates on humankind".
The Nowell Codex, perhaps more commonly known as the manuscript containing the Anglo-Saxon epic Beowulf, also contains references to Cynocephali. One such reference can be found in the part of the manuscript known as The Wonders of the East, in which they are called "healfhundingas" or "half-dogs." Also, in Anglo-Saxon England, the Old English word wulfes heafod ("wolf's head") was a technical term for an outlaw, who could be killed as if he were a wolf. The so-called Leges Edwardi Confessoris, written around 1140, however, offered a somewhat literal interpretation: “[6.2a] For from the day of his outlawry he bears a wolf's head, which is called wluesheued by the English. [6.2b] And this sentence is the same for all outlaws.” Cynocephali appear in the Old Welsh poem Pa Gur? as cinbin (dogheads). Here they are enemies of King Arthur's retinue; Arthur's men fight them in the mountains of Eidyn (Edinburgh), and hundreds of them fall at the hand of Arthur's warrior Bedwyr (later known as Bedivere). The next lines of the poem also mention a fight with a character named Garwlwyd (Rough-Gray); a Gwrgi Garwlwyd (Man-Dog Rough-Gray) appears in one of the Welsh Triads, where he is described in such a way that scholars have discussed him as a werewolf.
High and late medieval travel literature
Medieval travellers Giovanni da Pian del Carpine and Marco Polo both mention cynocephali. Giovanni writes of the armies of Ogedei Khan who encounter a race of dogheads who live north of the Dalai-Nor (Northern Ocean), or Lake Baikal. Polo's Travels mentions the dog-headed barbarians on the island of Angamanain, or the Andaman Islands. For Polo, although these people grow spices, they are nonetheless cruel and "are all just like big mastiff dogs".
Additionally, in the Chinese record History of the Liang Dynasty (Liang Shu), the Buddhist missionary Hui-Sheng describes an island of dog-headed men to the east of Fusang, a nation he visited variously identified as Japan or the Americas. The History of Northern Dynasties of Li Yanshou (李延寿), a Tang dynasty historian, also mentions the 'dog kingdom'.
The use of dog-headed, human-bodied characters is still very strong in modern literature. In the domain of comics publishing in North America and in Europe many works feature an "all-cynocephalic" cast or use the heads of dogs and other animals together for social comment or other purposes.
- In the Pulitzer Prize winning graphic novel Maus by Art Spiegelman, Jews have human bodies and the heads of mice while characters with their roots in the United States have human bodies and the heads of dogs, Germans have the heads of cats, and the French have the heads of frogs.
- The comic book Ghost Rider features a villain named Doghead. He is an anthropomorphic dog who serves Blackheart, the son of Mephisto, the Marvel Comics version of the devil.
- The hero of Baudolino, a novel by Umberto Eco, has to face dog-headed people at the end of his journey.
- At the beginning of A Dog's Head, a novel by Jean Dutourd, a woman gives birth to a child with a dog's head.
- Dog-headed creatures based on the ancient accounts appear in many modern role-playing games, such as Dungeons & Dragons.
- A fearsome race of dog-faced warriors appear in Terry Jones' book Erik the Viking.
- The title character in Scott Adams' cartoon Dilbert once dated a dog-headed woman, described as "fetching."
Other dog-headed creatures in legend
- The Talmud states that at the time before the Messiah, the "face of the generation will have the face of a dog." Talmud, Sotah 49b; Talmud, Sanhedrin 97a
- The Chinese legend of Fu Xi included variations where he had a dog's head, or he and his sister Nu Wa had ugly faces.
- In the United States there are tales of dog-headed creatures, including the Michigan Dogman, and the wolf-like Beast of Bray Road of Wisconsin.
- The Wulver of the Scottish Shetland Isles.
- Psoglav in Serbian mythology.
- Pasoglavac, Pesoglavac in Croatian mythology.
- The Nacumerians, in The Voyage and Travels of Sir John Mandeville.
- Related phenomena
- Theriocephaly, generic term for human-shaped bodies with animal heads
- Werewolves, which figure in archaic Greek and other European traditions.
- The binomial name for the yellow baboon is Papio cynocephalus, while Cynocephalus has also been adopted as the genus name for an Asian arboreal gliding mammal also known as a colugo.
- Ctesias, Indica §§ 37, 40-3
- Megasthenes, Indica, vis-a-vis Pliny the Elder, Historia Naturalis 7.2: 14-22; Fragments XXX. B. Solin. 52. 26-30.
- Herodotus. The Histories. translated by A. D. Godley. 4.191.
- The Expedition of the Argonauts.
- Augustine of Hippo, City of God, Book XVI, Chapter 8
- David Gordon White, Myths of the Dog-man (University of Chicago Press) 1991:32.
- Ross, L. (1996). Medieval Art: A Topical Dictionary. Westport. p. 50.
- Walter of Speyer, Vita et passio sancti Christopher martyris, 75.
- simulant se in castris suis habere cynocephalos, id est canini capitis homines. Divulgant apud hostes, hos pertinaciter bella gerere, humanum sanguinem bibere et, si hostem adsequi non possint, proprium potare cruorum. Paul the Deacon, Historia gentis Langobardorum Book 1, ch. 11.
- Notker, Life of Charlemagne, Book II §3.
- Patrologia Latina 121: 1153-56.
- Vincent, Speculum naturale, 31:126.
- lupinum enim caput geret a die utlagacionis sue, quod ab Anglis 'uuluesheued' [= Old English wulfes heafod 'wolf's head'] nominatur. Et haec sententia communis est de omnibus utlagis. Leges Edwardi Confessoris § 6.
- Green, p. 84-85.
- Bromwich, p. 73–74
- Bromwich p. 385
- John of Plano Carpini, The long and wonderful voyage of Frier Iohn de Plano Carpini, Chapters 11 and 15
- Yule, Henry and Cordier, Henri. The Travels of Marco Polo, Chapter 13, Vol II
- Henri Cordier's 'Notes and Addenda' in the Sir Henry Yule edition of The Travels of Marco Polo, Volume 2.
- Talmud, Sotah 49b; Talmud, Sanhedrin 97a
- Godfrey, Linda S. (2003). The Beast of Bray Road: Tailing Wisconsin's Werewolf. Big Earth Publishing. p. 58-61. ISBN 1-879483-91-2. Retrieved 14 October 2010.
- Bromwich, Rachel (2006). Trioedd Ynys Prydein: The Triads of the Island of Britain. University Of Wales Press. ISBN 0-7083-1386-8.
- Ctesias, Indica, as excerpted by Photios in his Epitome, tr. J.H. Freese, available from Livius.org.
- Green, Thomas (2007). Concepts of Arthur. Stroud, Gloucestershire: Tempus. ISBN 978-0-7524-4461-1.
- Megasthenes, Indica, tr. J.W. McCrindle, Ancient India as Described by Megasthenes and Arrian. Calcutta and Bombay: Thacker, Spink, 1877. 30-174, available from Project South Asia
- Paul the Deacon, Historia gentis Langobardorum ("History of the Lombards"), ed. L. Bethmann and G. Waitz, "Pauli historia Langobardorum." In MGH Scriptores rerum Langobardicarum et Italicarum 1 (saec. VI-IX), ed. G. Waitz. Hanover, 1878. 12-187; tr. Foulke, W.D. History of the Langobards. Univ. of Pennsylvania, 1907. Available from Northvegr.
- Leges Edwardi Confessoris, ed. and tr. Bruce R. O'Brien, God's peace and king's peace: the laws of Edward the Confessor. Philadelphia: Univ. of Pennsylvania Press, 1999. ISBN 0-8122-3461-8.
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- Yu. A. Zuev, The Strongest Tribe, (Ch. 2 Ancient Uigurs, Mongols and Tibet. Tribe of the Red Dog), Materials of International Round Table, Almaty 2004 ISBN 9965-699-14-3
- Christopher Columbus & the Monstrous Races