alternatehistory.com

I read in a book about the assassins that in the 830's Caliph-Al-Mamun tried to impose orthodoxy upon Islam, which would have made the caliphs as powerful as the popes of the Roman Catholic Church, but he failed, and within a few decades, a century or two at most, the caliphs had become powerless puppets in the hands of their Turkish bodyguards.

What would have changed if Al-Mamun had got his wish?
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