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As the title states. Your challenge, if you choose to accept it, is to have an independent nation that englobes the entirety of the Orthodox balkans (modern greece, serbia, montenegro, bulgaria and romania minus transylvania) by the year 1880, with a POD no earlier than 1750 (couple of decades before the national awakening. This country must NOT be a Russian puppet and must get Constantinople and Bessarabia by the year 1900. Each ethnic group is to at least partially retain their own language for domestic use, but have Greek as the language of education, legislation and lithurgy. Bonus points if you get it to percieve itself as a Byzantine restoration.
Good luck!
Edit: Here is a good piece of info for anyone who's not very familiar with the situation