I am grateful for the serious discussion on all sides of this issue.
For a long time, my knowledge of "The Church of the East" consisted of Acts 16:6: "and they went through the region of Phyygia and Galatia, having been forbidden by the Holy Spirit to speak the word in Asia."
My interest began, as I may have mentioned, with Samuel Hugh Moffett's very serious "
A History of Christianity in Asia." Moffett traces the growth of Christianity eastward from that point, as "The Old Silk Road," a major trade route, extended northeast from Antioch into Edessa, east toward Nisibis (where one of the great early schools of Christianity was located), southward along the Tigris River through Mosul, Tekrit, Baghdad, Seleucia-Ctesiphon, (the border between Roman and Persian empires; we know this area as Iraq), before heading straight east through Persia, modern Afghanistan, and onward to China.
This eastward expansion of Christianity led to the development of a thriving church outside of the Roman Empire which grew in spite of a truly "Great Persecution" in the 4th century. As Moffett says, the conversion of the Roman Empire "was enough to make any Persian ruler conditioned by three hundred years of war with Rome suspicious of the emergence of a potential fifth column."
Persia's (Zoroastrian) priests and rulers cemented their alliance of state and religion in a series of periods of terror that have been called the most massive persecution of Christians in history, \"unequalled for its duration, its ferocity and the number of martyrs.\" (Moffett 138)
By the time this persecution ended, in around 401 ad, Moffet says, "one estimate is that as many as 190,000 Persian Christians died in the terror. It was worse than anything suffered in the West under Rome, and yet the number of apostasies seemed to be fewer in Persia than in the West, which is a remarkable tribute to the steady courage of Asia's early Christians." (145)
This "Church of the East" emerged from that period of persecution and adopted the the canons of the Council of Nicaea and the Nicene Creed unanimously in about 410 ad. It was a church which knew next to nothing of Rome and Constantinople and Alexandria, nothing of their feuds, nothing of their supposed "authority." It was this church which looked to Theodore of Mopsuestia as one of its greatest theologians. It was this church which took the "ill-fitting name for the church in non-Roman Asia, 'Nestorian.'"
Later, this church lived through the invasions of Islam, and largely died at its hand after the 12th century invasions of these lands under Ghengis Khan.
This history is one reason why I believe it is important to really understand how this branch of Christianity, which held some beliefs that we would not hold today. Their quite orthodox faith in Christ (those early centuries), their endurance, their rejection after the utterly reprehensible council of Ephesus, make the arguments of "who was greatest" among the "great" centers of Christianity -- Rome, Alexandria, Constantinople -- seem quite small and petty by comparison.