Treaty of Hadyach

1658, Ukraine

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June 29, 2026

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The Treaty of Hadyach, signed in 1658, was an agreement between Hetman Ivan Vyhovsky of Ukraine and Poland. This treaty aimed to establish a self-governing Grand Duchy of Rus within a tripartite commonwealth alongside Poland and Lithuania. However, it faced opposition from Polish magnates, the Cossacks, and Moscow, and was never implemented.1

Following this, Ukraine entered a period of chaos known as "the Ruin." The country was eventually partitioned along the Dnieper River in 1667 by the Truce of Andrusovo. The western part, the Right Bank, returned to Polish rule, while Russia gained control of the eastern Left Bank, including Kyiv. This division led to further conflict and attempts to unify Ukraine under different powers, including the Ottoman Empire.1

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Ukraine
The Ruin
…in 1658 concluded the new Treaty of Hadyach with Poland. By its terms, central Ukraine (attempts to include Volhynia and Galicia were unsuccessful) was to constitute—under the hetman and a ruling elite of nobles and officers—the self-governing grand duchy of Rus, joined with Poland and Lithuania as an equal member…
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…in 1658 concluded the new Treaty of Hadyach with Poland. By its terms, central Ukraine (attempts to include Volhynia and Galicia were unsuccessful) was to constitute—under the hetman and a ruling elite of nobles and officers—the self-governing grand duchy of Rus, joined with Poland and Lithuania as an equal member…
Read More