How does Cuneglas link to Glastonbury Abbey in the first place? Isn't Cuneglas stated to be the charioteer of Din Arth? Dinarth still exists - it's at the head of the Conwy estuary near Llandudno in North Wales.
You aren't suggesting that the glas element somehow evidences a link, are you? It was a very common element that just describes a colour - or, more properly, a range of colours that today we would call gray or greeny gray. Glas appears in many place-names across the UK, including Glasgow.
'Cuneglas' means 'Grey dog'. It's got no more connection to Glastonbury than anyone called Steven has to Stevenage.
I come at this from an academic angle and scholarly angle has much as I can but unlike many who are very black and white in their approach, I also come at it from the angle of trying to put myself in inside a medieval mind, the mind of the people, the scribe, the imagery, what they saw in their imagination when they were hearing and reading things.
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You only have to look at some of the old manuscripts, illuminated and similar to see the imagery. I can also state as categorical fact that these images and drawings appeared in medieval plea rolls, certainly in the 13th century has I have seen them and if given time to look back over my emails, could prove this. Images of snakes and strange creatures doodled in the margins. This is why I approach subjects like this has said slightly differently to some of the very black and white approaches seen on this forum for instance.
ut quid in nequitiae tuae uolueris uetusta faece et tu ab adolescentiae annis, urse, multorum sessor aurigaque currus receptaculi ursi, die contemptor sortisque euis depressor, cuneglase, romana lingua lanio fulue (romaneranames.uk)
Cyn: is a common element of early Welsh names and would appear to come from a Brittonic word which has arrived in modern Welsh as cy; the Celtic word being cognate with the Latin cane, and even more closely with the Greek kynos – all of which mean dog. However there is another and perhaps better candidate for the meaning of the early Welsh name prefix Cyn(e)- ; that is the Welsh word cun , (readily interchangeable with cyn) now considered archaic and obsolete, which means lord or chieftan. This appear the most likely meaning and much more credible than accepting the cyn = dog etymology. Although the use of animal names, especially with sacred overtones, is not unlikely in Celtic culture, the epithet 'chieftan' or possibly ‘warrior’ makes far more sense as a name form - especially one that crops up so frequently in King lists. We should note here too that the word cun is also found in the (probably even more archaic form) cuniaid, which would imply a Brittonic form such as *cuniato. This longer form of the word could then explain the hanging vowel Cunein older forms the name Cynglas/Cuneglasus, which would come from an abbreviated prefix from *cuni- (ato). Glas: is the Welsh for blue. It is similarly cognate with the Latin: glaucus and Greek: glaukos which strictly speaking mean sea-blue, or grey-blue, the colour of blue eyes. The linguistic interchange is even easier to see when we understand that in British Latin the letter ‘c’ was normally pronounced as an ‘s’; so glaucus would become ‘*glausus’ in ordinary speech, the equivalent Brittonic probably being *glasos. Therefore the name written out in Latin form as Cuneglasus could indeed mean Bluedog, or even perhaps Greyhound, although it would more probably appear to mean Blue Chieftan.
If this is correct then there is another possible origin of the name Cuneglas, lord or chief and blue/glaucus.
We don't know how every medieval person, scribe thought, what they, the individuals thought were the origins of names, what was in their imagination, imagery.
(PDF) Cuneglasus, Ursus and King Arthur. | Dane Pestano and Mak Wilson - Academia.edu
'Ut quid in nequitiae tuae volvuris vetusta faece et tu ab adolescentiae annis, urse, multorum sessor auriga cue currus receptaculi ursi'
If this is the correct latin text from Gildas, where is the word 'tu' which signifies 'thou bear'? From this latin, from the actual latin it just says 'bear' which could be taken in a different context to 'thou bear' by someone reading?
Could a scribe with is own imagination, imagery, what he knew have seen Cuneglas 'lord or chief of Glas' and the word urse-arth and associated? Glas looks as if it may have the same origin as Glastonbury may ultimately have so would a medieval scribe, person have thought 'lord of Glas' signifies/means 'lord or chief of Glastonbury' especially with the urse-arth? No doubt there will be the usual statements of conjecture and no evidence but has I have repeated and repeated before, these are records from medieval times and the dark ages and there simply aren't enough surviving records and information to record anything as fact, there is always a degree of conjecture/possibility with everything. I am just exploring a possibility as to why Glastonbury may have become associated with Arthur, Henry II is too late for the ultimate association.