An unholy Rurikid-Makedon alliance, on top of some random Armenian adventurer carving up an empire in Central Asia, plus a Caliph's nephew with a Socotran wife, among several things, made the Religion distribution much more...pink.
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By, the way, about that Armenian adventurer...when most Persian territories became de-jure Byzantines, he ended up forming the Persian Empire with just Transoxiana. His dinasty has also a curious name...
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Hint: Read it without the "un" before the final i.