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The idea is to have someone as socially progressive as possible while still being brutal enough to both unite the steppes into some sort of confederation encompassing all of the contiguous eurasian nomads, make their reforms stick and to keep the peace of whatever realm they carve up. Some kind of extortion racket could be set up against adjacent settled people to keep the loot flowing. Perhaps this state could facilitate and tax trade in the same vain as the mongols. They could also get some kind of monopoly on Siberian goods.

Edit:What kind of social conditions could create such a person? What would their reforms be?
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