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Well, the previous thread sucks and the choices are limited, so I'm creating an all-new AH Challenge with the same description:
Recently, I've read (and commented on one of the) different TL's tackling a single topic: a very successful Byzantine Empire, where they defeated the Seljuk Turks and maintained their territory.
Here's the challenge: A possible alternate homeland for them (the Seljuk Turks), and I added a poll for the possible choices.