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Is it possible for there to be sustained settlement of the Canary islands from the Byzantine era (it was known at least since Juba II during the era of Octavian/Julius Caesar). Leading to the establishment of an island kingdom that survives and trades with the Islamic world and Christian europe throughout the era of the N. African Caliphates maybe with refugees from N. Africa and Iberia immigrating and sustaining a Byzantine church.
Spreading the Byzantine rite (their version anyway) to parts of W/Africa such that it is extremely difficult if nay impossible to justify the slave trade by (pious) Europeans when the Americas are discovered