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During the history of the Roman Empire. It seemed that the Emperors, in addition to the Imperial Cult (the concept that the Emperor was a demigod or even a god in human form), there were also various other cults, some taken from other polytheisms (Isis from Egyptian mythos, Cybele from Greek, Mithra from Persian, Sol from Roman et.al.), that focused almost exclusively one one god/goddess as the central god/goddess.

I ask, could such cults develop into a monotheistic religion?
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