Church of the East

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The Church of the East is the East Syriac Christian church that grew up outside the Roman Empire, in the Persian lands east of the imperial frontier, and from there reached farther east than any other branch of ancient Christianity. Its liturgical and theological language was Syriac, a dialect of Aramaic; its heartland lay in Mesopotamia under Sasanian and later Islamic rule. The common older name for it, “the Nestorian Church,” is a label fixed on it by outsiders, and modern historians use it warily.

The Christological quarrel that set this church apart turned on how the divine and the human are joined in Christ. The Council of Ephesus in 431 condemned Nestorius, patriarch of Constantinople, for teaching — as his accusers framed it — that the two natures remained so distinct that Mary could not properly be called “God-bearer.” The Church of the East never accepted that condemnation and kept to the Antiochene theological tradition Nestorius came from, emphasizing the full reality of Christ’s humanity. Whether its mature doctrine is in fact the heresy named after Nestorius is a question scholarship now treats with care; recent dialogue has read the difference as largely one of vocabulary. The church organized itself early under its own head, the catholicos at Seleucia-Ctesiphon, and a synod in 410 confirmed that independence — a separation as much political as doctrinal, since a church inside Persia could not answer to bishops inside the empire Persia fought.

Its lasting distinction is geographic reach. From the theological school at Nisibis, missionaries and merchants carried the faith eastward along the trade routes. A stone monument raised at Xi’an in 781, rediscovered in the seventeenth century, records in Chinese and Syriac the arrival of “the luminous religion” at the Tang court a century and a half earlier — the firmest evidence that this church reached China. It planted communities among the Turkic peoples of Central Asia, and the Saint Thomas Christians of southern India long looked to its hierarchy. At its medieval height its bishoprics stretched from the Mediterranean to the Chinese coast, a single church spanning most of Asia.

That breadth contracted sharply. The collapse of the Mongol order, the campaigns of Timur, and later pressures reduced the church to its Mesopotamian core and the Malabar coast, while a portion entered communion with Rome as the Chaldean Catholic Church. The surviving body, the Assyrian Church of the East, remains small.

The spread of Christianity was not only westward. While Latin and Greek Christendom argued over the same Christ, an Asian church carrying a different verdict was already teaching in languages those councils never heard.

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