Vikings also brought change in eastern Europe, which was largely populated by Slavs. In antiquity the Slavs lived in central Europe, farming with iron technology, building fortified towns, and worshipping a variety of deities. With the start of the mass migrations of the late Roman Empire, the Slavs moved in different directions and split into what historians later identified as three groups: West, South, and East Slavs.

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The group labeled the West Slavs included the Poles, Czechs, Slovaks, and Wends. The South Slavs, comprising peoples who became the Serbs, Croats, Slovenes, Macedonians, and Bosnians, migrated southward into the Balkans. In the seventh century Slavic peoples of the west and south created the state of Moravia along the banks of the Danube River. By the tenth century Moravia’s residents were Roman Christian, along with most of the other West and South Slavs. The pattern of conversion was similar to that of the Germanic tribes: first the ruler was baptized, and then missionaries preached, built churches, and spread Christian teachings among the common people. The ruler of Poland was able to convince the pope to establish an independent archbishopric there in 1000, the beginning of a long-lasting connection between Poland and the Roman Church. In the Balkans the Serbs accepted Orthodox Christianity, while the Croats became Roman Christian, a division with a long-standing impact; it was one of the factors in the civil war in this area in the late twentieth century.

Between the fifth and ninth centuries the eastern Slavs moved into the vast areas of present-day European Russia and Ukraine. This enormous area consisted of an immense virgin forest to the north, where most of the eastern Slavs settled, and an endless prairie grassland to the south. In the tenth century Ibrahim Ibn Jakob, a learned Jew from the Muslim caliphate in Córdoba in Spain, traveled in Slavic areas. He found the Slavs to be “violent and inclined to aggression,” but far cleaner than Christians in other parts of Europe in which he had traveled, “who wash only once or twice a year.” Such filthy habits were unacceptable to someone raised in Muslim Spain, but the Slavs had an ingenious way of both getting clean and staying healthy: “They have no bathhouses as such, but they do make use of wooden huts [for bathing]. They build a stone stove, on which, when it is heated, they pour water. . . . They hold a bunch of grass in their hands, and waft the stream around. Then their pores open, and all excess matter escapes from their bodies.”5

In the ninth century the Vikings appeared in the lands of the eastern Slavs. Called “Varangians” in the old Russian chronicles, the Vikings were interested primarily in gaining wealth through plunder and trade, and the opportunities were good. Moving up and down the rivers, they soon linked Scandinavia and northern Europe to the Black Sea and to the Byzantine Empire’s capital at Constantinople. They raided and looted the cities along the Caspian Sea several times in the tenth century, taking booty and slaves, which they then sold elsewhere; thus raiding turned into trading, and the Scandinavians later established settlements, intermarried, and assimilated with Slavic peoples.

In order to increase and protect their international commerce and growing wealth, the Vikings declared themselves the rulers of the eastern Slavs. According to tradition, the semi-legendary chieftain Ruirik founded a princely dynasty about 860. In any event, the Varangian ruler Oleg (r. 878–912) established his residence at Kiev in modern-day Ukraine. He and his successors ruled over a loosely united confederation of Slavic territories known as Rus, with its capital at Kiev, until 1054. (The word Russia comes from Rus, though the origins of Rus are hotly debated, with some historians linking it with Swedish words and others with Slavic words.)

Oleg and his clansmen quickly became assimilated into the Slavic population, taking local wives and emerging as the noble class. Missionaries of the Byzantine Empire converted the Vikings and local Slavs to Eastern Orthodox Christianity, accelerating the unification of the two groups. Thus the rapidly Slavified Vikings left two important legacies for the future: in about 900 they created a loose unification of Slavic territories, Kievan Rus, under a single ruling prince and dynasty, and they imposed a basic religious unity by accepting Orthodox Christianity, as opposed to Roman Catholicism, for themselves and the eastern Slavs.

Even at its height under Great Prince Iaroslav (YAHR-uh-slahv) the Wise (r. 1019–1054), the unity of Kievan Rus was extremely tenuous. Trade, not government, was the main concern of the rulers. Moreover, the Slavified Vikings failed to find a way to peacefully transfer power from one generation to the next. In early Rus there were apparently no fixed rules, and much strife accompanied each succession. Possibly to avoid such chaos, Great Prince Iaroslav, before his death in 1054, divided Kievan Rus among his five sons, who in turn divided their properties when they died. Between 1054 and 1237, Kievan Rus disintegrated into more and more competing units, each ruled by a prince claiming to be a descendant of Ruirik. The princes divided their land like private property because they thought of it as private property. A prince owned a certain number of farms or landed estates and had them worked directly by his people, mainly slaves, called kholops in Russian. Outside of these estates, which constituted the princely domain, the prince exercised only limited authority in his principality. Excluding the clergy, two kinds of people lived there: the noble boyars and the commoner peasants.

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The boyars were descendants of the original Viking warriors, and they also held their lands as free and clear private property. Although the boyars normally fought in princely armies, the customary law declared that they could serve any prince they wished. The ordinary peasants were also truly free. They could move at will wherever opportunities were greatest. In a touching phrase of the times, theirs was “a clean road, without boundaries.”6 In short, fragmented princely power, private property, and personal freedom all went hand in hand.