Quarrel of Mongolian Princes and Dating of the Mongols Campaign to South-Western Rus

The purpose of this article is to research the information by historical sources related with the Mongolian invasion to the South-Western Rus, determination exact dates of the conquest of Russian southern cities and consideration the quarrel of the Mongol princes, as a turning point in the history of the Mongol invasion and the Mongol empire. The author has some several conclusions. Firstly, the Russian chronicles, the chronicle of Rashid al-Din, and the “Secret History of the Mongols” contain the information, by which we can reconstructing the chronology of events past. Secondly, to determination an accurate chronology of the events of the Mongol invasion of South-Western Russia, it is important to use a source such as “The Secret History of the Mongols”, which was written by an eyewitness to the events that unfolded in the residence of the Mongolian emperor. Thirdly, the author was able to date the events associated with the capture of some southern Rus cities by the Mongols. The research has provided information that reveals the specifics of the Mongol conquest of Kiev, namely, the date of the event was clarified, and also identified the commanders who did not participate in this campaign and were mistakenly counted among the conquerors of Kiev, the “mother of Russian cities”.