One branch of the Eastern church, however, relaxed the rules of the Quinisext. In 431, Nestorius, Patriarch of Constantinople, was excommunicated for his heretical subtleties as to the nature of the Godhead in Christ. Driven out from the Empire by the orthodox authorities, his followers spread throughout Mesopotamia and Persia, where, by the end of the century, their efforts had gradually converted nearly the whole population. About the year 480, Barsuma, metropolitan of Nisibi, added to his Nestorian heresy the guilt of marrying a nun, when to justify himself he assembled a synod in which the privilege of marriage was granted not only to priests, but even to monks. In 485, Babueus, Patriarch of Seleucia, held a council which excommunicated Barsuma and condemned his licentious doctrines; but, about ten years later, a subsequent patriarch, Babeus, in the council of Seleucia, obtained the enactment of canons conferring the privilege of marriage on all ranks of the clergy, from monk to patriarch. Some forty years later a debate recorded between the Patriarch Mar Aba and King Chosroes shows that repeated marriages were common among all orders, but Mar Aba subsequently issued a canon depriving patriarchs and bishops of the right, and subjecting them to the rules of the Latin and Greek churches.[180] The career of the Nestorians shows that matrimony is not incompatible with mission-work, for they were the most successful missionaries on record. They penetrated throughout India, Tartary, and China. In the latter empire they lasted until the thirteenth century; while in India they not improbably exercised an influence in modifying the doctrines of ancient Brahmanism,[181] and the Portuguese discoverers in the fifteenth century found them flourishing in Malabar. So numerous were they that during the existence of the Latin kingdom of Jerusalem they are described, in conjunction with the monophysite sect of the Jacobines, as exceeding in numbers the inhabitants of the rest of Christendom.[182] * * * * *