This is a wonderful thread! I don't know how I didn't see it before.
I want to believe that dragons existed. They have become myth, which needs to be untangled - and they are still represented in very disparate places.
There is a dragon, to this day, on the Welsh flag.
There have been dragons on Chinese roofs from the year oatcake until the C19th. I joined my OH at the end of his contract in China (in 2017) and we spent a month touring. We didn't hear much about big dragons but, 'Pixiu/Pichu (the baby dragon who eats but never shits)', was special. In China, that wee dragon guards you and your wealth (note how similar it seems to that Pokemon character, Pikachu).
We bought an antique, Pixiu. It's beautifully carved, in jadeite (with a vampire bat on its back) and It needed its own passport to get out of China.
I've just searched, 'Pichou', to get the spelling right...and this is what I found at wickedpedia
Pixiu - Wikipedia
Seems a lot darker than the way it was described to us. Ours does have one, 'horn', which is more like a pony-tail...which is being tugged on by the vampire bat. I kind of wish that I hadn't looked now.
Anyway, then there are, 'The Dragoons', in both England and France. Both named after the word, 'Dragon'. Fire-breathing cannon?
Here's the badge of the feared, '2me Regiment Dragons', in France
2nd Dragoon Regiment (France) - Wikipedia
Sorry for using Wikipedia but it was the simplest and quickest place to go for these examples.
Then...there's my experience, living in Lagos (Nigeria)...where the dragon is considered to be the beast which rose from the sea...which links me to Achilles and Henry II.
So, I should leave it right there. No proof and I do not want to derail the thread.
Regarding the flag of Tartary; is there a difference between a dragon and a wyvern?