I'd guess they were regular White explorers and natives of various places started telling stories they were gods from the massage advances in technology and knowledge they had in comparison.

Other theories are of the dual creation hypothesis as Genesis seems to have two, one in ch1 and another in ch2. Some say White people were created as Adam and Eve in the garden but "savages" (still made in God's image with a soul that can be saved) were here long before, some suggesting Noah and his sons after landing on the Caucasus mountains after the flood started spreading out and people didn't know what to think of them. I think that's listed here:

https://en.wikipedia.org/wiki/White_gods#Proponents

Tuatha Dé Danann is an interesting one, as the Aryans were travelers by horseback traveling across these regions.

Political correctness bans these topics from being discussed (to the point even saying "Aryan" will get you banned off platforms), and the world rulers hate White people, so it makes me wonder. It often feels something is being hidden (ancient race war that is also spiritual) so we don't remember our origins lest we gain confidence in who we once were and take back power.