I’m new to posting on reddit and haven’t figured out how to grab links from my phone, but there is a section in the community info called “frequently asked questions” and if you go to religion and mythology, then scroll down to “here be dragons”, you will find a few posts that elaborate on this.

I am doing my own research on the topic, and what I have found is that the western Dragon has come from Norse mythology. It was referred to as a wyrm or “worm” which meant “snake”. In old Norse culture, the snakes and serpents were associated with evil, and as Scandinavian/Germanic/British cultures began overlapping with Roman culture, the description of the devil/Satan in revelation was assumed to be a dragon or wyrm

Going to the FAQ page, the real historians are able to provide tons of resources for this. But as a fellow curious soul, I couldn’t resist attempting to help! Cheers!