The next determining factor in the early history of Russian literature is the Church. Vladimir, Prince of Kiev, married the sister of the Emperor of Byzantium and was baptized; henceforward Christianity began to spread (987-8), but the momentous fact is that it was the Christianity of the East. The pearl of the Gospels, says Soloviev, was covered over with the dust of Byzantium, and Russia was committed to the Greek tradition, the Greek rivalry with the West and was consequently excluded from the civilization of the West and the great intellectual community of which Rome was the centre. This fact is of far-reaching and momentous importance. No less important was the introduction of the Slavonic liturgy, which was invented by two Greek brothers from Saloniki, in the ninth century, who tried to force their Macedonian dialect on all the Slavs, and succeeded in the case of Bulgaria and Servia. A century or so later it reached the Russian Slavs. Through Bulgaria, the Russians acquired a ready-made literature and a written language in a dialect which was partly Bulgarian and partly Macedonian, or rather Macedonian with Bulgarian modifications. The possession of a written language acted as a lever as far as culture was concerned. In the eleventh century, Kiev was one of the most enlightened cities in Europe.
The rulers of Kiev were at this time related to the Kings of France, Hungary, Norway, and even England. The Russian MSS. of the eleventh century equal the best MSS. of Western Europe of the same period. The city of Kiev was a home of wealth, learning, and art. Byzantine artists went to Kiev, and Kiev sent Russian painters to the West. There seemed at this time to be no barrier between East and West. Nothing could be more promising than such a beginning; but the course of Russian history was not destined to run smooth. In the middle of the eleventh century, the foundations of a durable barrier between Russia and Western Europe were laid. This was brought about by the schism of the Eastern and Western Churches. The schism arose out of the immemorial rivalry between the Greeks and the Latins, a rivalry which ever since then has continued to exist between Rome and Byzantium. The Slavs, whom the matter did not concern, and who were naturally tolerant, were the victims of a racial hatred and a rivalry wholly alien to them. It may seem unnecessary to dwell upon what some may regard as an ancient and trivial ecclesiastical dispute. But, in its effects and in its results, this "Querelle de Moine," as Leo X said when he heard of Luther's action, was as momentous for the East as the Reformation was for the West. Sir Charles Eliot says the schism of the Churches ranks in importance with the foundation of Constantinople and the Coronation of Charlemagne as one of the turning points in the relations of West and East. He says that for the East it was of doleful import, since it prevented the two great divisions from combining against the common enemy, the Turk. It was of still more doleful import for Russia, for the schism erected a barrier, which soon became formidable, between it and the civilizing influences of Western Europe.