Let’s not leave out U. of Bremen Prof. Emeritus Gunnar Heinsohn who says there are a missing 700 years in the archaeological record starting around the late 200’s AD. The guy is a respected academic who has NOT been removed from his post for crazy ideas. He backs up everything with a fresh look at archaeological strata, or rather, missing strata throughout the Mediterranean. Go here for more -
folks pushing this nonsense ignore the chinese, persian and eastern roman records.
There’s a bit more room for speculating about “missing time” in the archaeological record, or rather archaeologists’ synthetic timelines based on that record. But usually those type of theories are more plausible the further back you go, since there are fewer solid historical records to cross-reference to the archaeology. The 3rd century AD is a little late to try and mount those kind of arguments, I think, because there are just too many things we can cross-reference to each other by that time.
Conference talk by Heinsohn on asteroid impact in late 200’s AD and missing archaeological strata
https://www.youtube.com/watch?v=nhh6GNhPknU
He’s, uh, not entirely reliable, particularly in the Indus region, I think he’s the one who claims the ruins of the Harappan civilization is actually thousands of years younger ruins of Alexander the Great’s successors in the east.