I played that game on until the 1850s, interfering with other civs as little as possible so I could see how they did on their own.
The Byzantine Empire expanded a little more into Europe, taking Italy and later Wien, and vassalised the displaced Turks. They lost a few cities to the German flip, but kept doing very well, with Greece, Turkey, Austria, Italy, Babylon, the near east, and part of Arabia in their empire.
However, somewhere in the 1830s they lost Verona and Sparta to a congress and collapsed the next turn. Their unique power kept them alive, but then Russia suddenly steamrolled through Turkey with a stack of Cossacks.
Another strange thing in this game: when America spawned (having only French and Spanish colonies to flip since I killed England), it received the name Empire of Columbia. Constantinople was the holy city of Catholicism, while Rome was the holy city of Orthodoxy. France also got a very strangely shaped country when it respawned:

The Byzantine Empire expanded a little more into Europe, taking Italy and later Wien, and vassalised the displaced Turks. They lost a few cities to the German flip, but kept doing very well, with Greece, Turkey, Austria, Italy, Babylon, the near east, and part of Arabia in their empire.

However, somewhere in the 1830s they lost Verona and Sparta to a congress and collapsed the next turn. Their unique power kept them alive, but then Russia suddenly steamrolled through Turkey with a stack of Cossacks.
Another strange thing in this game: when America spawned (having only French and Spanish colonies to flip since I killed England), it received the name Empire of Columbia. Constantinople was the holy city of Catholicism, while Rome was the holy city of Orthodoxy. France also got a very strangely shaped country when it respawned:
