The first is quite free from Nestorian influence, dates from some remote period, perhaps prior to 431, and is certainly the most ancient of those now in use in Christendom; the other two, though early, are undoubtedly of later date.
Holm, The Nestorian Monument (Chicago, 1909).
Marco Polo is witness that there were Nestorian churches all along the trade routes from Bagdad to Pekin.
The chief Nestorian authors were (a) in the 7th, 8th and gth centuries, Babbai the elder and Isho-yabh of Gedhala, commentators; Sandona, who wrote on the monastic life; Abraham the Lame, a devotional and penitential writer; Dionysius of Tell Mahre (see DIONYsIUs Telmaharensis), whose Annals are important; and Thomas (q.v.) of Marga; (b) in the 14th century, Abdh-isho bar Berikha (d.
Born probably between 415 and 420 he imbibed Nestorian doctrine from Ibas at the Persian school of Edessa, but was driven out in 457 on the death of his master, and went to be bishop of Nisibis.
On the death of the bishop Mar Athanasius Matthew in 1877, litigation began as to his successor; it lasted ten years, and the decision (since reversed) was given against the party that held by the Nestorian connexion and the habitual autonomy of the Malabar church in favour of the supremacy of the Jacobite patriarch of Antioch.
Political conditions at the beginning of the middle ages favoured the Nestorian church, and the fact that the Arabs had conquered Syria, Palestine and Egypt, made it possible for her to exert an influence on the Christians in these countries.
The Nestorian writers of the 6th century were numerous, but as yet we know little of their.
In the East (Council of Ephesus, 431) he was helped by the entanglement of Pelagianism with Nestorianism, just as in the West the ruin of Nestorian prospects was occasioned partly by dislike for the better known system of Pelagianism.
In Bagdad he stayed several years, studying the Koran and other works of Moslem theology, for controversial purposes, arguing with Nestorian Christians, and writing.