AHC: With a POD after 500 AD, Have AUC be the Dominant Dating System in Europe

How could AUC reemerge permanently as the dominant dating system in Europe with a POD of 500 anno domini or later?

Bonus points if it eventually becomes universally accepted, a la anno domini dating.
 
Could work if the starting date in question is 330 AD for Constantinople :) Just butterfly the plague of Justinian and let the Empire not muck up too much.
 
A miraculously resurgent Byzantium that is even more into emphasising its Roman heritage adopts the date and spreads it around a bit?
 
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