The Græco-Russian Church is perhaps the most important element of the politico-religious complications in which Europe is at present involved. It is, moreover, not a fortuitous cause of these complications, but has been growing during centuries, until it has reached its present magnitude, though its action upon Turkey may have been prematurely brought into play by accidental circumstances. It comprehends within its pale about 50,000,000 of souls, whilst it exercises an immense influence upon 13,000,000 of Turkish, and a considerable one upon more than 3,000,000 of Austrian subjects, professing the tenets of that church, though governed by separate hierarchies. To this number must be added the population of the kingdom of Greece, amounting to about 1,000,000: so that the whole of the followers of the Eastern Church may be computed in round numbers at 66,000,000 or 67,000,000 of souls.(100) The Russian Church differs from other Greek churches, not in her tenets, but in her government. From the establishment of Christianity in Russia, towards the end of the tenth century, to the capture of Constantinople by the Turks in 1453, the Russian Church was governed by a metropolitan, consecrated by the Patriarch of Constantinople. After this event, the metropolitans were consecrated by the Russian bishops till 1588, when a patriarch of Russia was instituted by that of Constantinople, who had arrived at Moscow, in order to obtain pecuniary assistance for his church. The patriarch enjoyed considerable influence, which modified in some respects the despotic authority of the Czar. It was Peter the Great who abolished this dignity in 1702, after the death of the Patriarch Adrian, and declared himself the head of the Russian Church. He introduced several regulations to restrict the power of the clergy, and to improve their education. It appears that the violent reforms by which that monarch tried to introduce the civilization of western Europe amongst his subjects, had produced an intellectual movement in their church, but which, not squaring with the views of the imperial reformer, was violently suppressed by him. Thus, in 1713, a physician called Demetrius Tveritinoff, and some other persons, began to attack the worship of images, and to explain the sacrament of communion in the same sense as has been done by Calvin.