16th-Century Chart - Prester John (Wikimedia)
What happens to a mythical priest-king when you get too close to him? Does he just disappear?
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Sources:
Prester John: The Legend and its Sources, compiled and translated by Keagan Brewer. Taylor & Francis, 2019.
Ray, John. A Collection of Curious Travels & Voyages. 1693.
Salvadore, Matteo. The African Prester John and the Birth of Ethiopian-European Relations, 1402-1555. Taylor & Francis, 2016.