Theodorus of Mopsuestia (about 350 - 428), also known as Theodorus of Antioch (named after his birthplace), was bishop of Mopsuestia (also Mopsueste, now Misis in southern Turkey) from 392 to 428.
He followed a philosophical education and later became a student of Diodorus from Tarsus. Together with his friend and fellow citizen Johannes Chrysostomus, he became a monk at an early age. In 383, he was devoted to the priest and left Antioch for Tarsus, where he remained until his bishopship in 392. Theodorus' episcopate in Mopsuestia was quiet, without striking events.
During his life, Theodorus regarded itself as an orthodox Christian thinker. He fought arianism and other heresies in his diocese. He refused to grant the Virgin Mary the title of Theotokos. Later after his death it was claimed that he influenced Nestorius and was a predecessor of Nestorianism.
The condemnation of Ephesus (431) condemned Nestorius, but also Theodorus's creed was condemned without its name falling. Then the Nestorians proclaimed that Theodorus's words perfectly reflected their view.
Later, the Nestorians in Persia considered the scriptures of Theodorus as the standard in the doctrine and interpretation. The Assyrian Church of the East expressed the ban on who was against or rejected the writings.
The Assyrian Church of the East regards Theodorus as one of their church teachers, along with Diodorus of Tarsus and Nestorius. Also see
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