Nestorianism, Christian heresy that held Jesus to be two distinct persons, closely and inseparably united. In 428, Emperor Theodosius II named an abbot of Antioch, Nestorius (d. 451?), as patriarch of Constantinople. In that year Nestorius, who had been a pupil of Theodore of Mopsuestia, outraged the Christian world by opposing the use of the title Mother of God for the Virgin on the grounds that, while the Father begot Jesus as God, Mary bore him as a man. This view was contradicted by Cyril, patriarch of Alexandria, and both sides appealed to Pope Celestine I. The Council of Ephesus (see Ephesus, Council of) was convened in 431 to settle the matter. This council (reinforced by the Council of Chalcedon in 451) clarified orthodox Catholic doctrine, pronouncing that Jesus, true God and true man, has two distinct natures that are inseparably joined in one person and partake of the one divine substance. Nestorius, deposed after the Council of Ephesus, was sent to Antioch, to Arabia, and finally to Egypt. A work believed to be by Nestorius, Bazaar of Heraclides, discovered c.1895, gives an account of the controversy. The patriarch of Antioch and his bishops, accusing Cyril of unscrupulous action, stayed out of communion with Alexandria until a compromise was reached in 433, but though the subject was discussed in 553 at the Second Council of Constantinople (see Constantinople, Second Council of), Nestorianism was practically dead in the empire after 451. Nestorianism survived outside the Roman Empire through missionary expansion into Arabia, China, and India from the 6th cent., but declined after 1300. The doctrines that continued in the Nestorian Church had diminishing connections with those of Nestorius. The teachings of Eutyches and Monophysitism developed partially in reaction to Nestorianism. J. Pelikan, The Emergence of the Catholic Tradition (1971); and R. Norris, ed. and tr., The Christological Controversy (1980).
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