I was doing geological research trying to show how crustal displacement theory is incorrect, and stumbled upon a paper that elucidated the insight:

There was a localized weakening of the geomagnetic field in the Levant and in the Med (3 actual areas) starting at roughly 1200 and ongoing until about 600! Im pretty sure Im the first person to posit this theory, but the more I steelman against it the more I think I'm onto something, and the implications are huge... because it has more to do with other subjects such as the evolution of religion in the region too. My theories on that are harder to prove but will be the follow up paper, at first Im just trying to focus on the geological proof.

Essentially a localized reduction in geomagnetic shielding allowing increased cosmic ray flux and solar radiation caused destruction, migration, religious interpretations of what was being seen in the sky, and all the war and tumolt that would come along with those...