| founder = [[Thomas the Apostle]], by its tradition
| founded_date = Apostolic Age, by its tradition
| founded_place = [[Sasanian Empire]]
| founded_place = [[Sasanian Empire]]<ref name="Wilken 2013"/>{{refn|group=note|Traditional Western historiography of the Church dated its foundation to the [[Council of Ephesus]] of 431 and the ensuing "[[Nestorian Schism]]". However, the Church of the East already existed as a separate organisation in 431, and the name of Nestorius is not mentioned in any of the acts of the Church's synods up to the 7th century.{{sfn|Brock|2006|p=8}} Christian communities isolated from the church in the Roman Empire likely already existed in Persia from the 2nd century.{{sfn|Brock|2006|p=11}} The independent ecclesiastical hierarchy of the Church developed over the course of the 4th century,{{sfn|Lange|2012|pp=477–9}} and it attained its full institutional identity with its establishment as the officially recognized Christian church in Persia by Shah [[Yazdegerd I]] in 410.{{sfn|Payne|2015|p=13}}}}
