These Mirzas organized loosely knit dominions, which were all under the nominal authority of the Khan of Tyumen and Sibir.
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Islam was the professed religion of the Sibir Khanate; it was the religion of the ruling Khan of Tyumen and Sibir.
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Mirzas also led the warriors of the Khanate of Sibir into battle and owed nominal allegiance to the Khan of Tyumen and Sibir.