Nope. You can direct a Crusade versus rebel cities (Vilnius IIRC in Vanilla) but not vs. Orthodox Christians. Definitely not vs. the Byzantines, and I think Russa has to be in the same boat. Can you show a screenshot confirming this? Way it could work is if the majority of the religion is something other than Catholic or Orthodox and it can't be owned by a Catholic or Orthodox faction (it CAN be rebel owned)
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