The International Prester John Project: How A Global Legend Was Created Across Six Centuries

Prester John's Nestorianism

There are three texts predating the "Letter" that mention a distant priest king called John. They are listed below. All three express that this figure was a Nestorian Christian, which would have counted as a heretic in the Catholic West.

Nestorianism referred to the belief that Christ was of two natures: both human and divine. This belief was condemned as heresy by the European Catholic Church at the Council of Chalcedon in 451, two decades after being condemned at the Council of Ephesus by the Byzantine Church in 431. 

By the time of Prester John's advent in the 12th century, both Nestorianism and its opposite, monophysitism (which declared that Christ was of a single divine nature), had long been considered heretical by the Catholic Church, though it must be said that the Catholic position in which Christ's human nature was "absorbed into" his divine could be understood as uncannily similar (or only slightly semantically differentiable) from Nestorianism. 

Although the Letter itself does not mention John's Nestorianism explicitly, this denominational adherence became part of the lore surrounding John and his kingdom within the century. 

The historically accurate association of Nestorianism with St. Thomas (and India) naturally led many of those invested in the legend to project Prester John's kingdom somewhere in India (a name that at the time of course encompassed basically everything from China to Ethiopia). The following map depicts the locations of Nestorian churches in the Middle Ages:

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