Abstract
The article provides an original letter of the Murza of the Crimean Khanate to the King of Poland in 1663, which mentions the diplomatic activities of the future Hetman of Ukraine Ivan Mazepa. Analyzing the original document in the Main Archive of Ancient Acts in Warsaw (Poland), the authors conclude that Ivan Mazepa, as the personal secretary of King Jan II Casimir, was instructed by him to deal with the "Crimean" and "Ukrainian" directions of the Polish-Lithuanian state. The published letter is one of the first documentary mentions of the political activity of such an outstanding figure in the history of Ukraine and Eastern Europe as Ivan Mazepa. In addition, the submitted document reveals the place of the Crimean Khanate in international relations in the 1660s and its role in the preparation of a joint Polish-Tatar-Ukrainian military campaign of 1663–1664 against the Muscovy in the Left Bank of Ukraine.
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