Diplomatic correspondence of Ivan the Terrible - the most complete edition of letters to the highest authorities of Europe and Asia and in the opposite direction in the languages ​ ​ of the originals. The corps of correspondence is the first publication of this kind on the history of Russian diplomacy of the era of Ivan IV and the Russian state as a whole before the reign of Peter I. Embassy letters identified in handwritten collections and publications reflect one of the most intense periods of diplomatic exchange in the history of Russia.