From the downfall of the Byzantine Empire in 1453, the center of Eastern Orthodoxy slowly shifted from the Byzantine church, which suffered a tragic deterioration under the rule of the Turk, to the Empire of the Russian Orthodox tsars. Before the World War, the predominant rôle in numbers and resources as well as in spiritual and theological leadership was played by the church of Russia. Out of the total of some 144 millions of Orthodox adherents, the Russian membership comprised about 110 millions. By reason of its wealth and of the generous financial aid which it freely dispensed to the rest of the needy Orthodox communions, Russia exercised a far reaching, in some instances controlling, influence among them. Moreover, the Russian Slavophil theologians and publicists have been largely instrumental in the modernization of Orthodox theology which they have restated in modern philosophico-religious terms. In turn, the Russian thought has affected all Orthodox communions and has exercised a dominant theological influence over them.