In 864, on the death of his brothers, Ruric consolidated their territories with his, assumed the title of grand prince, peaceably took possession of Novgorod and made it his capital, naming the country Russia, after his native place. With the advent of the Varangians the authentic history of Russia begins. The millenary of that event was celebrated in 1862 at Novgorod, as the foundation of the Russian empire. Ruric died in 879. In the next hundred years his successors conquered many neighboring lands and added them to the empire. Kieff became the capital. Numerous invasions into the territory of the Greek empire were made and Constantinople was frequently attacked, resulting sometimes in repulse, and at others in exacting heavy tribute from the Eastern Emperor. Treaties were executed and a gradual growth of commerce and intercourse between the Greeks and Russians took place. Olga, the famous and popular widow of Ruric's son, Igor, became a Christian and was baptized in Constantinople in 955, and during the rest of her life lent her powerful influence to the spread of the faith. And though her son, the emperor Sviatoslaf, remained a pagan throughout his reign, Christianity continued to grow, and the general Christianization of Russia during the reign of her grandson, Vladimir, was aided materially by the great example of the good queen Olga. In 970 Sviatoslaf divided his empire among his three sons, Iaropolk I, Oleg, and Vladimir. After the death of Sviatoslaf in 972 civil war began between the three brothers. Oleg was killed and Vladimir fled to Sweden. In 980, supported by a force of Varangians, Vladimir returned, captured Novgorod and Kieff, and put Iaropolk to death. Under Vladimir, later known as Vladimir the Great, Russia increased in importance, and civilization was enhanced by the spread of Christianity through the missionary efforts of the Greek Church, now the Holy, Orthodox, Catholic, Apostolic, Oriental Church. It is, therefore, not strange that the Russian prelates were distinguished by their loyalty and fidelity to the Greek Church throughout the continued conflicts between it and the Roman Church which resulted in their separation in 1054. In the fifteenth century, with the consent of the patriarchate of Constantinople, the Orthodox Graeco-Russian Church assumed national independence, and became the state church; and after the establishment of Mahometanism in Constantinople, since its capture by Mahomet II in 1453, the reigning Czar of Russia has come to be regarded not only as the temporal and spiritual head of the Greek Church by the great mass of adherents which form the bulk of the population in Russia, but also as the champion of all the followers of the church in Greece and throughout the orient.