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In the OTL, Sebastian I was crushed by a much larger force from Saadi Morocco and the Ottoman Empire under the command of Abd Al-Malik. With Sebastian's death, Portugal entered a succession crisis with the ultimate winner being Spain who, under Phillip II, incorporated it into the Spanish Habsburg and created the Iberian Union.
But, what if Sebastian I won the battle? What would the result be of a Portuguese victory over the Islamic forces? Could he even had won at the battle site or should he have taken the advice of his commanders and held his position?