I'm also going with Bulgaria. Propsto IFWanderer for pointing it out.
Look how Bulgaria has managed to take provinces near Constantinople from the Byzzies, who have otherwise grown a lot from their weak starting position. Don't think an AI is capable of that.
I did originally think the player was Byzantium due to aforementioned blobbing, but they've also lost quite a few provinces, and expanded in directions that I doubt a player would choose (taking Cyprus before consolidating Greece?).
Look how Bulgaria has managed to take provinces near Constantinople from the Byzzies, who have otherwise grown a lot from their weak starting position. Don't think an AI is capable of that.
I did originally think the player was Byzantium due to aforementioned blobbing, but they've also lost quite a few provinces, and expanded in directions that I doubt a player would choose (taking Cyprus before consolidating Greece?).