A mysterious figure ruling at the fringes of the known world, Prester John might be the most famous person you've never heard of. Like a medieval Carmen Sandiego, Prester John was a man people searched the globe for, from Ethiopia, to Tibet, to the New World, never quite catching up to him in the end. So, who was Prester John and why were medieval people so keen to find him? This week, Danièle speaks with Chris Taylor about where the legend comes from, how it may have had a disastrous effect on the fifth crusade, and what Prester John has to do with the Fantastic Four.

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