This book tells how the Moscow principality that arose among the conquered Mongol-Tatars of Russia for 400 years turned into a kingdom in which the language and culture of the Russian people were formed, the foundations of the economy were laid and the historical borders of Russia were delineated. Moscow Rus scientists call the state that existed in the period between the eras of Ancient Rus (X - the beginning of the XIII century). ) and the Russian Kingdom (XVII in . ). The Slavs, who came to the Volga-Oka River from the Kiev and Novgorod lands, created a new powerful state there - the Vladimir-Suzdal principality. Center for the Development of Ancient Russia at the End of XII - Beginning of XIII in . gradually shifted from the south to the north-east . Vladimir princes were less and less interested in the Kiev throne the real capital of Russia, they already considered their capital city Vladimir. However, in the late 1230s, North-Eastern Russia was crushed by the blows of the Mongol-Tatars .. From this time begins the history of Moscow Russia - the history of liberation from the yoke of the invaders, the creation of an independent and then multinational kingdom. The development of all Russian lands turned out to be connected with the strengthening of a small specific principality with a center in Moscow. For 400 years, the Moscow principality has collected almost all the lands that once belonged to Ancient Russia, began to master the Eurasian steppes, taiga and tundra. In Moscow Russia, the language, national character and culture of the Russian people were formed, the foundations of the economy were laid, the historical borders of Russia were delineated. "What Is What" is a series of thematic encyclopedias published from 1994 to 2001 by the publishing house "Word" and aimed at school-age children. Initially, it was translated materials of a similar German series "Was ist was", but later, as part of the series, the publishing house began to produce works by domestic authors. The abundance of illustrations, fascination, diversity and accessibility of the presentation of the material predetermined the great popularity of the series. "What is What" easy reading - serious knowledge!Other books in the series "What is What":Byzantine Wolves of Heaven. Flags Calendar. Caves of the Cat. Time. Dolls. Butterflies Sculpture. Our Body . Ancient Greeks Ancient myths Myths of Slavs Sun Apes Ancient China . Painting Orbital Stations . Underwater exploration of the Earth Planet Ancient Greece. Trees. Forest. Poisonous plants . Money from Russia . Multimedia and virtual worlds Natural Disasters Mountains Pyramids Museums Travelers . Crusaders Weather. Bees, Bumblebees, Wasps Moors Elephants Fish Birds Ships Gladiators Samurai. Pirates. Water. Bridges . Geographic Maps of the Witch Star. Internet Seven Wonders of the World Predators Nuclear Power Arctic and Antarctic. Indians Horses Dinosaurs Ancient Russia . Moscow Rus Revival . Mysterious Treasure Phenomena . Tropical Forest