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 in the year 428 began to propagate his heresy, denying the hypostatic union. The Council of Ephesus denounced him, and, in spite of the emperor and court, Nestorius was anathematized and driven into exile. His sect spread through the East, and became a flourishing church. It reached to China, where the emperor was all but converted; its missionaries traversed the frozen tundras of Siberia, preaching their maimed Gospel to the wild hordes which haunted those dreary wastes ; it faced Buddhism, and wrestled with it for the religious supremacy in Thibet; it established churches in Persia and in Bokhara; it penetrated India; it formed colonies in Ceylon, in Siam, and in Sumatra; so that the Catholicos or Pope of Bagdad exercised sway more extensive than that ever obtained by the successor of St. Peter. The number of Christians belonging to that communion probably exceeded that of the members of the true Catholic Church in East and West. But the Nestorian Church was not founded on the Rock; it rested on Nestorius; and when the rain descended, and the winds blew, and the floods came, and beat upon that house, it fell, leaving scarce a fragment behind.

Rubruquis the Franciscan, who in 1253 was sent