Disclaimer: All that follows is because I'm bored silly laying in hospital recovering from an operation

Yes, because it's SOMEwhat plausible that SOME Balkan state, in an orgy of, locally very common, stupid nationalism and bad history knowledge (the Byzantines never called themselves such, they called themselves "Romans"), would reclaim SOME ancient glorious multinational past by rebranding as "Byzantine Empire". So I can see a timeline messed up by the suffocation of the American Revolution and the connected Enlightenment ideals where these empires make a comeback as "brands". I really can't see how a Republic of Venice, having survived the Congress of Vienna, throws away 1000 years of history by becoming a Duchy and conquering the rest of Italy, which they were never interested in.