Sebastianism is the Portuguese manifestation of a redeemer myth based on the legend of the so-called rey encubierto (Hidden King) that emerged in Andalusia in the early 16th century. The legend – conflating medieval prophetic texts of St. Isidore of Seville with the Arthurian Legend – predicted a ruler of the Spanish people who would defeat the Turks and establish the Fifth Monarchy, the everlas…