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Возможные причины военной экспедиции монголов в Северо-Восточную Русь и Мордовскую землю зимой 1239/1240 г
The article examines an inconspicuous episode that occurred during Batu's second campaign against Rus’, which is usually dated by researchers to 1239–1241. The author puts forward and substantiates the possible reasons that prompted the Mongol military leaders to send a second military expedition to North-Eastern Rus’ in the winter of 1239/1240, which also affected the nearby lands of Mordovia, when the main forces of the conquerors were already ravaging the southern Rus’ principalities. The author agrees with A. A. Gorsky's hypothesis that the Mongols resent troops to North-Eastern Rus’, concerned about the actions of the new prince of Vladimir, Yaroslav Vsevolodovich. According to the author, the Murom principality, which was not affected by the Mongols in 1237-1238, maintained allied relations with Yaroslav Vsevolodovich, as it was before the Batu invasion in Rus’, therefore it was the first to be ravaged by the Mongols on their way to the Vladimir Rus’. After the departure of the conquerors to Southern Rus’, in the winter of 1239/1240 it was Purgas who raised the uprising in the Mordovian land, continuing to openly fight for independence.