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alternatehistory.com
I'm new to this particular genre of alternate history so go easy on me.
What is the latest possible date for a resurgent Roman Empire based in Rome and recognizably Roman? What does such a mixture of Roman nostalgia and Middle Ages technology and culture look like and how does it effect the geo-political atmosphere of medieval Europe and the world?
I hope I don't have to go into much more detail than that on what my admittedly vague description of "recognizable" entails.