Abstract: The subject of this study is the image of central power in the Muscovite state. The research object is the views of the Rostov archbishop Vassian on the tsar’s image and the essence of his power as described in his “Epistle on the Ugra” in 1480. The author examines in detail the historical context of the named text’s creation, the possible reasons that motivated archbishop Vassian to address his prince, and the ideological content of his work. Particular attention is given to Vassian’s thoughts on the legitimacy of the Horde’s rule, closely intertwined with his thoughts on the nature and designation of regal power, and the true meaning of the title “tsar”. The article’s research is conducted through the use of methods of comparative analysis, political-textological analysis of sources and historical-political reconstruction. In addition, the work uses general scientific methods – analysis, synthesis, induction, deduction, comparison and others. The work’s novelty lies in its evaluation of the “Epistle in the Ugra” as a spiritual-political text. The author comes to the conclusion that Vassian from Rostov tried to influence through his works the solution of the specific political issue at hand, and for the first time in Russian political thought elaborated a detailed argumentation of the rights of Muscovite Grand Princes to the regal title and simultaneously proved the lack of such a right among the Horde rulers, using the Holy scriptures as his main argumentation source. The presented by him image of a “Christ-loving tsar”, which consequently became the subject of lively activity among Russian scribes, firmly established itself in the ideology of the Russian state.