The Mongols, their conquests, and the travellers who went to see them were all going to necessitate some changes to the Prester John narrative. This episode is all about those changes.
It's 1442, and Shah Rukh, the son of Timur, is sending an ambassador to Qaliqut / Kozhikode on the Indian coast. That ambassador, Abd-al-Razzāq, sails from Hormuz and experiences delays, sickness, death, and disappointment. Making matters worse, he never actually wanted to go.