The article is devoted to the issue of migration in Russia in the Early-modern time the Orthodox subjects of the Ottoman Empire and its vassal States. It presents the dynamics of migration, the analysis of its causes, revealed the social origins of immigrants, studied the place which they received in Russian society. Found that the Russian government was interested in migration. The Greeks always were readily accepted in Russia and received Russian citizenship. The Russian government was guided by several motives. In the first place, the government proceeded from the doctrine of Moscow as the III Rome. The concept was laid on the Russian Tsar functions of the Byzantine Emperor.