Coel (Old Welsh: Coil) or Coel Hen ("Coel the Old") is a figure prominent in Welsh literature and legend since the Middle Ages. Early Welsh tradition knew of a Coel Hen (Coel the Old), a leader in Roman or Sub-Roman Britain and the progenitor of several kingly lines in the Hen Ogledd ("the Old North"), the Brittonic-speaking part of northern England and southern Scotland. Later medieval legend told of a Coel, apparently derived from Coel Hen, who was the father of Saint Helena and the grandfather of Roman Emperor Constantine the Great. Other similarly named characters may be confused or conflated with the Welsh Coel. The traditional "King Coel" may be the historical basis for the popular nursery rhyme "Old King Cole".
Coel's name was rendered "Coil" in Old Welsh. It may be related to the common noun coel, meaning "belief or omen". Coel is often named as "Coel Hen", Hen being an epithet Hen meaning "old" (i.e., "Coel the Old"). The genealogies give him an additional epithet, Godebog (Old Welsh: Guotepauc), meaning "Protector" or "Shelterer". His name is thus sometimes given as "Coel Godebog" or "Coel Hen Godebog". However, some of the Harleian genealogies list Godebog as Coel's father's name. Geoffrey of Monmouth Latinized the name to Coelus. Some modern authors modernize it to "Cole".
Context and evidence
Coel Hen appears in the Harleian genealogies and the later pedigrees known as the Bonedd Gwŷr y Gogledd (The Descent of the Men of the North) at the head of several post-Roman royal families of the Hen Ogledd. His line, collectively called the Coeling, included such noted figures as Urien, king of Rheged; Gwallog, perhaps king of Elmet; the brothers Gwrgi and Peredur; and Clydno Eiddin, king of Eidyn or Edinburgh. He was also considered to be the father-in-law of Cunedda, founder of Gwynedd in North Wales, by his daughter Gwawl. The poem Y Gododdin mentions some enmity between the "Sons of Godebog", possibly a reference to the Coiling, and the heroes who fought for the Gododdin at the Battle of Catraeth.
Judging by the genealogical references, Coel Hen must have controlled a large part of the Hen Ogledd. As an ancestor figure, he compares to Dyfnwal Hen, who is likewise attributed with founding kingly lines in the Hen Ogledd. According to Welsh tradition the region of Kyle was named for Coel, and a mound at Coylton in Ayrshire was regarded as his tomb. Projections back from dated individuals suggest that Coel Hen lived around AD 350–420, during the time of the Roman departure from Britain. In his book The Age of Arthur, historian John Morris suggested Coel may have been the last of the Roman Duces Brittanniarum (Dukes of the Britons) who commanded the Roman army in northern Britain, and split his lands among his heirs after his death. However, Morris' book has been widely criticized.
By the 12th century, Coel had become attached to the "Colchester legend", which claimed he was a ruler of Colchester in Essex and the father of Saint Helena, and therefore the grandfather of Constantine the Great. Coel became associated with Colchester based on the idea that the city was named for him. According to the popular folk etymology, the name "Colchester" derived from "Coel" and "castrum", producing "fortress of Coel". In reality, the city was known as Colneceaster until the n was dropped in around the 10th century; its name likely comes from the local River Colne.
Around the same time, a further development of this legend that King Coel of Colchester was the father of Saint Helena, and therefore the grandfather of Constantine the Great, appeared in Henry of Huntingdon's Historia Anglorum and Geoffrey of Monmouth's Historia Regum Britanniae. The passages are clearly related, even using some of the same words, but it is not clear which version was first. Henry appears to have written the relevant part of the Historia Anglorum before he knew about Geoffrey's work, leading J. S. P. Tatlock and other scholars to conclude that Geoffrey borrowed the passage from Henry, rather than the other way around. The source of the claim is unknown, but may have predated both Henry and Geoffrey. Diana Greenway proposes it came from a lost hagiography of Helena; Antonia Harbus suggests it came instead from oral tradition.
Geoffrey's largely legendary Historia Regum Britanniae expands upon Henry's brief mention, listing Coel as a King of the Britons following the reign of King Asclepiodotus. In the Historia, Coel grows upset with Asclepiodotus's handling of the Diocletianic Persecution and begins a rebellion in his duchy of Caer Colun (Colchester). He meets Asclepiodotus in battle and kills him, thus taking the kingship of Britain upon himself. Rome, apparently, is pleased that Britain had a new king and sends a senator, Constantius Chlorus, to negotiate with Coel. Afraid of the Romans, Coel meets Constantius and agrees to pay tribute and submit to Roman laws as long as he is allowed to retain the kingship. Constantius agrees to these terms, but Coel dies one month later. Constantius marries Coel's daughter, Helena, and crowns himself as Coel's successor. Helena subsequently gives birth to a son who becomes the Emperor Constantine the Great, giving a British pedigree to the Roman imperial line.
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