What is very definite is a letter, the Letter of Prester John, believed to be a forgery, which was supposedly written to the Byzantine Emperor Manuel I Comnenus (1143-1180) by Prester John, the King of India. This letter, appearing around 1165, which recounted many marvels of richness and magic, captured the imagination of Europeans and circulated in ever more embellished form for centuries and shortly after the invention of printing in printed form, being still current in the popular culture during the period of European exploration. During the Second Crusade there was also hope that Prester John would come to the aid of the holy cities and capture back Palestine from the Muslims.
The reports were so far believed that Pope Alexander III sent a letter to Prester John via his emissary Phillip, his physician, on September 27, 1177. Phillip was never heard of again. Several Asian tribes were identified with Prester John by travellers, but from the 14th century onward his empire was sometimes placed in Africa, and in the 15th and 16th centuries it became considered to be equivalent to the Christian kingdom of Ethiopia. Prester John was often also identified as a descendant of the Magi, or a descendant of St. Thomas, who had supposedly founded an early (and therefore more pure) church in India. When the Mongols invaded Palestine in the 13th century, the Christians inhabiting the remnants of the Crusader States also believed Genghis Khan was Prester John, coming to rescue them from the Muslims. Another possible origin for Prester John is Toghrul Khan, a Nestorian Khan defeated by Gengis.
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