I presume the author was asking for something not ASB.A.D. 503: A massive plague sweeps across the world, killing every human it infects. The city of Constantinople cuts itself off from the outside world and survives. The rest of the Eurasian population dies.
Extrapolate.
I presume the author was asking for something not ASB.
Ah, I didn't see the second half of the scenario. My badIf he was asking for non-ASB, then he wouldn't have requested Byzantines all over Europe and Asia.