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As I am sick at home I had some time to catch up with a few things that I wanted to read for several years but failed to find time.
So I read about Mesopotamia between the sack of the Bagdad by the Mongols and the Ottoman conquest of the region and a posibility came to me.
How would be possible to achieve a Turkic state with the core territories in upper mesopotamia, with the captiol in Mosul. The country would have to become the prominent Muslim power in the world on the same level Ottoman Empire was OTL, the POD would have to be between 1335 and 1370.