Interesting for me as it partly connects with real facts and real religion. Scythians said they descended from a snake mother and Celts had the same legend, according to Greek writers. Arthur of Pen"dragon" indicates that, as does the red/white dragon legend of Saxons.
A Cambridge prof tells me the ancient Scandinavians were influenced by Russian culture when travelling there, but were not influenced by Scythians . That's weird, as Scythians were the people that were there.
It may be that there was a common legend. The Norse dragon Jormungandr seems linked to George who was probably a pre-Christian legend. The Greek hero Jason with his argonauts met a dragon in Colchis, Georgia (south Russia) in Scythian territory. The word "jormungandr" may derive from the root word *ghdem "earth" (ghthem) which became in Norse jord/ jorth "earth", jordh "land" and jorem "farmer". Their form of "george" is Jorn Jory Jorma, as in Greek Jorge and Gr jornr is "farmer". "George" is from ge "earth" and ergon "work", "farmer". Thor who kills Jormungandr is a god of thunder and farmers. So both legends are about a farmer and the earth snake. Some Norse and Saxon weapons have a swastika cross marked on them, like George's cross, the flag of Georgia , and Moscow has a statue of George and dragon as its patron saint.
Scythians reached north Poland and also ruled northern India 2000 years ago and evidently their fellow-tribe Kambojas traded with Sri Lanka and ruled Cambodia (of the Kamboja name). That naga snake dynasty derived from the lady Pen, of Phnom Penh meaning "top hill" as in Sanskrit (and Welsh). Angkor Wat is a temple of squares within squares as a cross shape, and the naga king climbed the central tower to meet the snake goddess. The king of Babylon wore the kambuj robe, like the Kambujiya (Cambyses) kings of Persia and also had a dragon escort animal which was taken to the Tower of Babylon when the king climbed to the top each Spring to meet the fertility goddess.
Today the Knights of the Garter climb the steps of the castle to meet George and his dragon with his cross flag. It is very likely that Britons had a tower or hill where Y Ddraig Goch and the chiefs met.