alternatehistory.com

As you know after Justinian I reconquered most of the old Western Empire and his son Justinian II (OOC: This is the POD. In TTL he has a son who is also very competent.) helped strengthen the new frontier the empire was never threatened again. It eventually pushed the barbarian tribes out of Europe altogether including areas never under imperial rule at all such as Germania and Britannia. Is there a way for the empire to fall entirely and what would happen?
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