I think the Spanish source is less likely as much for reasons of geography as anything else. Turkey is a stone's throw from Venice, a city that always looked East, even nicking its church from the Kremlin. An east-west flow of coffee seems to make much more sense to me, and to every other resource I have been able to Google on it. Given that its origin was on the East Coast of Africa, the Arabia-Turkey-Italy route would have been much easier than one that required it to cross the Sahara to be brought into Spain. The remarkable lack of dissent among the online reference sources, seems not insignificant either. I just can't see Spain having any legitimate claim to this one.