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So thinking on PoDs for an Islamic Europe early on, and how to deal with the Eastern Roman Empire to make it possible, an idea came to me. It is pretty well established around here that the Arabs could not have taken Constantinple by force, but what if, instead, it is the Arabs supporting a claimant to the throne. Maybe this guy survives and requests help from the recently created Caliphate, and converts to (or promises to convert to) Islam in exchange. This causes the early Caliphs to focus on the Eastern Roman Empire rather than Sassanian Persia, and also causes a civil war within the Eastern Roman Empire itself, and eventually, the defenders of Constantinple surrender to the Arab-backed claimant. Islam is introduced to the Eastern Roman Empire, and then to Europe. Is this plausible?