Kievan Rus
The formation of the Kievan state that began in the mid-9th century, the role of the Varangians (Vikings) in this process, and the name Rus by which this state came to be known are all matters of controversy among historians. It is clear, however, that this formation was connected with developments in international trade and the new prominence of the Dnieper route from the Baltic to Byzantium, on which Kiev was strategically sited. Trade along this route was controlled by Varangian merchant-warriors, and from their ranks came the progenitors of the Kievan princes, who were, however, soon Slavicized. In the early chronicles the Varangians were also called Rus, and this corporate name became a territorial designation for the Kievan region—the basic territory of the Rus; later, by extension, it was applied to the entire territory ruled by members of the Kievan dynasty.
By the end of the 10th century, the Kievan domain covered a vast area from the edge of the open steppe in Ukraine as far north as Lake Ladoga and the upper Volga basin. Like other medieval states, it did not develop central political institutions but remained a loose aggregation of principalities ruling what was a dynastic clan enterprise. Kiev reached its apogee in the reigns of Volodymyr the Great (Vladimir I) and his son Yaroslav I (the Wise). In 988 Volodymyr adopted Christianity as the religion of his realm and had the inhabitants of Kiev baptized. Rus entered the orbit of Byzantine (later, Orthodox) Christianity and culture. A church hierarchy was established, headed (at least since 1037) by the metropolitan of Kiev, who was usually appointed by the patriarch of Constantinople. With the new religion came new forms of architecture, art, and music, a written language (Old Church Slavonic), and the beginnings of a literary culture. All these were vigorously promoted by Yaroslav, who also promulgated a code of laws, the first in Slavdom. Although Byzantium and the steppe remained his main preoccupations in external policy, Yaroslav maintained friendly relations with European rulers, with whom he established marital alliances for his progeny.
Following Yaroslav’s death, Kiev entered a long period of decline, only briefly stemmed in the 12th century under Volodymyr II Monomakh (Vladimir II Monomakh). Shifts in trade routes undermined Kiev’s economic importance, while warfare with the Polovtsians in the steppe sapped its wealth and energies. Succession struggles and princely rivalries eroded Kiev’s political hegemony. The ascendancy of new centres and the clustering of principalities around them reflected regional cleavages—historical, economic, and tribal ethnic—that had persisted even in the period of Kiev’s predominance. These differences were accentuated by the Mongol-Tatar invasions that began in the 1220s and culminated in the devastating sack of Kiev in 1240.
The territory that largely coincides with modern Belarus, with Polotsk as the most important centre, was one such emerging region. The land of Novgorod to its north was another. In the northeast, Vladimir-Suzdal (and later Moscow) formed the core from which developed the future Russian state (see also Grand Principality of Moscow). On Ukrainian territory, in the southwestern part of Rus, Galicia-Volhynia emerged as the leading principality.
Volodymyr (modern Volodymyr-Volynskyy) in Volhynia had been an important princely seat in Kievan Rus; and Galicia, with its seat at Halych, on the Dniester River, became a principality in the 12th century. In 1199 the two principalities were united by Prince Roman Mstyslavych to form a powerful and rich state that at times included the domains of Kiev. Galicia-Volhynia reached its highest eminence under Roman’s son Danylo (Daniel Romanovich). New cities were founded, most importantly Lviv; trade—especially with Poland and Hungary, as well as Byzantium—brought considerable prosperity; and culture flourished, with marked new influences from the West. In 1253 Danylo (in a bid for aid from the West) even accepted the royal crown from Pope Innocent IV and recognized him as head of the church, although nothing substantial came from this. Danylo’s reign also witnessed the rise of boyar-magnate unrest, debilitating dynastic involvements with Poland and Hungary, and the Mongol invasion of 1240–41. These marked the onset of Galicia-Volhynia’s decline, which continued until the extinction of Roman’s dynasty in 1340.