My only concern is that potentially (with a late enough POD), having the capital in Kiev butterflies Rus adopting Islam, and conversely having Muslim Rus probably butterflies Kiev.
Kiev (as a city, not as the villages that predated it or the Khazar outpost), grew out specifically out of the need to Dniepr trade going. Which goes to Bulgaria and Constantinople. Which were Christian, even when Kiev was in its infancy.
There are two ways that I can see: have a Muslim Constantinople very early (which changes oh so much), or have Constantinople inaccessible to Rus trade (perhaps blocked off Magyars or Pechenegs or whoever), leaving only the Volga route open (and even there, the Khazars are a consideration as well).
Kiev (as a city, not as the villages that predated it or the Khazar outpost), grew out specifically out of the need to Dniepr trade going. Which goes to Bulgaria and Constantinople. Which were Christian, even when Kiev was in its infancy.
There are two ways that I can see: have a Muslim Constantinople very early (which changes oh so much), or have Constantinople inaccessible to Rus trade (perhaps blocked off Magyars or Pechenegs or whoever), leaving only the Volga route open (and even there, the Khazars are a consideration as well).
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