The troubles which arose in Persia soon overturned this arrangement; and in the course of this history, we shall see how the sha, or emperor of Persia, Hussein, when persecuted by the rebels, implored the assistance of Peter; and how that monarch, after having supported a difficult war against the Turks and the Swedes, entered Persia, and subjected three of its provinces. But to return to the article of trade. _Of the Trade with China._ The undertaking of establishing a trade with China seemed to promise the greatest advantages. Two vast empires, bordering on each other, and each reciprocally possessing what the other stood in need of, seemed to be both under the happy necessity of opening a useful correspondence, especially after the treaty of peace, so solemnly ratified between these two empires in the year 1689, according to our way of reckoning. The first foundation of this trade had been laid in the year 1653. There was at that time two companies of Siberian and Bukarian families settled in Siberia. Their caravans travelled through the Calmuck plains; after they had crossed the deserts of Chinese Tartary, and made a considerable profit by their trade; but the troubles which happened in the country of the Calmucks, and the disputes between the Russians and the Chinese, in regard to the frontiers, put a stop to this commerce. After the peace of 1689, it was natural for the two great nations to fix on some neutral place, whither all the goods should be carried. The Siberians, like all other nations, stood more in need of the Chinese, than these latter did of them; accordingly permission was asked of the emperor of China, to send caravans to Pekin, which was readily granted. This happened in the beginning of the present century. It is worthy of observation, that the emperor Camhi had granted permission for a Russian church in the suburbs of Pekin; which church was to be served by Siberian priests, the whole at the emperor's own expense, who was so indulgent to cause this church to be built for the accommodation of several families of eastern Siberia; some of whom had been prisoners before the peace of 1680, and the others were adventurers from their own country, who would not return back again after the peace of Niptchou. The agreeable climate of Pekin, the obliging manners of the Chinese, and the ease with which they found a handsome living, determined them to spend the rest of their days in China. The small Greek church could not become dangerous to the peace of the empire, as those of the Jesuits have been to that of other nations; and moreover, the emperor Camhi was a favourer of liberty of conscience. Toleration has, in all times, been the established custom in Asia, as it was in former times all over the world, till the reign of the Roman emperor Theodosius I. The Russian families, thus established in China, having intermarried with the natives, have since quitted the Christian religion, but their church still subsists.