This study, which includes the translation and analysis of the Hagiography of Peter Ordinski, aims to show that Berke's schismatic actions in Ulus of Jochi, which emerged with their first examples the while Batu Khan was still alive, also had social consequences. Christianity in the capital of Golden Horde, in Saray, which can be traced till to the first half of the 1250s in the sources, suddenly has disappeared with the rule of the first Muslim Khan in the history of Golden Horde i. e. of Berke. In the sources giving information about the diplomatic relations, which established with the Papacy before Sartaq's death, has recorded that around fifty thousand Christian Mongols lived in the Ulus of Sartaq. But such a Mongolian Christian community is not encountered in the borders of Golden Horde after Berke. In this manner a record in the Ustyug-Vologda Chronicle about a large Mongolian community which inhabited Rostov until 1288, indicates that has occurred a change in the socio-political structure of the Saray after the political murder of Christian Sartak. Also the hagiography we have translated is about the lives of a Christian Mongolian nobleman who migrated from Saray to Rostov on the eve of Berke's seizure of power definitely and his descendants.