The purpose of the work is to trace on the existing corpus of written sources the stages of the development of statehood in the south of Western Siberia, the impetus of which, in our opinion, was given by the political crisis in the Golden Horde of 1359-1380. The period 1430-1508 is determined by us as the time of the existence of the Tyumen Khanate, however, due to the above reasons, both events immediately preceding this time period and inheriting it are affected.