IOTL, after the Latin conquest in 1204, Constantinople was eventually recovered in 1261. But lets say somehow (maybe Tsar Kaloyan is more stable and lives to 50-60), Bulgaria, rather than Nicea, eventually surrounds and takes Constantinople.
Some years back I wrote a TL with this very premise, and at the time the consensus of the board seemed to be that Grecophone Byzantine culture would have dominated this state. Thinking about it now, though, I'm...not so sure. If mega-Bulgaria also conquers Serbia at some point, it will control a fairly sizable Slavic-dominated area in the Balkans, larger and more populous than the Greek-speaking areas in the south. Especially if Constantinople is half-surrounded by the Bulgarians and becomes depopulated (like before its capture by the Ottomans IOTL), I can see a large influx of Bulgarian and Serbian speaking settlers becoming the demographic majority in the city. Likewise, OTL Greece is likely to be a mix of Greeks, Albanians, and slavs, and I can see Bulgarian becoming the lingua franca.
Thus, by the present, we might have:
Tsardom of the Romans
Language: Bulgarian
Capital: Tsargrad
Population ~70 million or so.
Area: OTL Greece, Bulgaria, Serbia, Albania, and western and central Turkey. Possibly Romania-this is likely to be fought over between the Roman Tsardom and whoever controls Hungary. Since Hungary is almost certain to be Catholic ruled, the Romanians are likely to support the Tsardom and might become Slavicized.
Croatia (includes most of OTL Bosnia) would likely stay Catholic and become a haven for opponents of the Tsardom with the support of Austria (or whoever the main central European power is). There would also likely be a Catholic population in Albania, which periodically rises against the Tsardom with Austrian and Italian support. Might become independent if the Tsardom's 20th century goes badly enough.
Thoughts?
Some years back I wrote a TL with this very premise, and at the time the consensus of the board seemed to be that Grecophone Byzantine culture would have dominated this state. Thinking about it now, though, I'm...not so sure. If mega-Bulgaria also conquers Serbia at some point, it will control a fairly sizable Slavic-dominated area in the Balkans, larger and more populous than the Greek-speaking areas in the south. Especially if Constantinople is half-surrounded by the Bulgarians and becomes depopulated (like before its capture by the Ottomans IOTL), I can see a large influx of Bulgarian and Serbian speaking settlers becoming the demographic majority in the city. Likewise, OTL Greece is likely to be a mix of Greeks, Albanians, and slavs, and I can see Bulgarian becoming the lingua franca.
Thus, by the present, we might have:
Tsardom of the Romans
Language: Bulgarian
Capital: Tsargrad
Population ~70 million or so.
Area: OTL Greece, Bulgaria, Serbia, Albania, and western and central Turkey. Possibly Romania-this is likely to be fought over between the Roman Tsardom and whoever controls Hungary. Since Hungary is almost certain to be Catholic ruled, the Romanians are likely to support the Tsardom and might become Slavicized.
Croatia (includes most of OTL Bosnia) would likely stay Catholic and become a haven for opponents of the Tsardom with the support of Austria (or whoever the main central European power is). There would also likely be a Catholic population in Albania, which periodically rises against the Tsardom with Austrian and Italian support. Might become independent if the Tsardom's 20th century goes badly enough.
Thoughts?