The last major event was the start of the mid-evil warming period which starved the agrarian Roman civilization to its end. Which was mild compared to what what we’re talking about here.
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How did warming starve the Romans?
This is an account of Alaric sac of Rome 411 AD before and after the sac of Rome. Notice how he was always in need of food. Same with the Romans they where in dire need of food.
He was only in Rome for 3 days. Sacked a couple of towns then with the word of food across the Mediterranean they took off with most of them that died on the trip.
https://dokumen.pub/a-history-of-the-later-roman-empire-ad-284641-2ndnbsped.html