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In length of history the Jesus Christ faith has engaged the scholars to itself so that various sects and many changes in this religion has formed. Bible, scripture of Christians , was gathered and compiled by special followers (Apostles) of Jesus Christ.
In the first centuries of Christianity the concerned issue was the political relation of two great powers, Sassanian government and Byzantine. Christians who always were under different vexation and turture of jews , scattered to all over the Byzantine and numerous of them were defected to Sassanid government.
Nestorian Christians were divided in two main branches.
1- Josephians , who were resident in Mosel and collaborated with Byzantine church.
2- Simonians , resident in Van and Orikeh (Assyrians - chaldeanians) the dispute between these two sects caused that simonians by Nastorious who was resident of Germanikeh leaved toward Iran. They took advantage from dispute of two side countries. Then proceeded to publication and propagation of christianty with reception of autority from Sassanid kings to
establish their own church against Byzantine church.
This essay considers the effects of Nastorian church on the political relation of Iran and Byzantine.