Grand Duchy of Moscow

The most powerful successor state to Kievan Rus' was the Grand Duchy of Moscow ("Moscovy" in the Western chronicles), initially a part of Vladimir-Suzdal. While still under the domain of the Mongol-Tatars and with their connivance, Moscow began to assert its influence in Western Russia in the early 14th century.

Those were hard times, with frequent Mongol-Tatar raids and agriculture suffering from the beginning of the Little Ice Age. Like in the rest of Europe, plagues hit Russia somewhere once every five or six years from 1350 to 1490. However, due to the lower population density and better hygiene (widespread practicing of banya),[72] the population loss caused by plagues wasn't so severe as in the Western Europe, and the pre-Plague populations seem to have been reached in Russia as early as 1500.

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