In 1875, Henry Van-Lennep stated that the term "Chaldean Church" is a "generic name" for Christian "Assyrians". Thus, speaking of the Nestorian Schism of 431, that occurred many centuries before the division of the Church of the East into those who accepted and those who rejected communion with the Catholic Church, he wrote: ""At the schism on account of Nestorius, the Assyrians, under the generic name of the Chaldean Church, mostly separated from the orthodox Greeks, and, being under the rule of the Persians, were protected against persecution"".