His published articles about the Skomorokhi from its roots in Kievan Russia, have been especially notable.

Unfortunately the plique-à-jour technique of Kievan Russia was lost after the crushing Mongol invasion in the 13th century.

The technique of plique-à-jour was adopted by Kievan Russia (strong trading partner of Constantinople) with other enamel techniques.

It has been characterised as a Russo-Byzantine helmet, indicative of the close cultural connection between Kievan Russia and Byzantium.

Much of what is now the Soviet Ukraine was part of Kievan Russia, a center of Slavic power in the 9th through 11th centuries.

Even though this indentured class grew greatly in numbers, the economy of Kievan Russia blossomed until 1125 the year of the death of Prince Vladimir Monomakh.

It was admitted to be progressive only in that it helped progress the supposedly feudal society of Kievan Russia as long as feudalism was a progressive force.

Though Kiev is the cradle of Slavic Christianity, it is incorrect to say that in 988 Prince Volodymyr (Vladimir) was the prince of Kievan Russia.

Kievan Rus', or Kievan Russia, was a medieval political union of East Slavic and Finnic tribes in Europe from the late 9th to the mid-13th century, under the reign of the Rurik dynasty.

The earliest civilization, Kievan Russia, was vibrant and progressive; when a Kievan princess married King Philip of France, she proved the only literate member of the royal family and signed all France's state documents.

In 988, Prince Vladimir of Kievan Russia marched his pagan subjects into the Dnieper River for a mass baptism, in the hope that Byzantine Christianity would unite the disparate Slavic tribes of his domain.

In each of three main cities on the westernmost fringe of the Soviet Union, newspaper editors and spokesmen for cultural organizations took pains to trace the origins of their towns to Kievan Russia, a ninth-century forerunner of the modern state, and to call the others who ruled here, no matter how long, foreign occupation powers.