Hadiach

Hadiach stands on the Psel in left-bank Ukraine. In the Cossack Hetmanate it became the centre of a regiment and for a time a Cossack hetman's residence. Its name is remembered for an agreement made nearby during the prolonged struggle over the political future of the Ukrainian Cossack lands.

In 1658 Hetman Ivan Vyhovsky and representatives of the Polish king concluded the Treaty of Hadiach. It proposed a Grand Duchy of Ruthenia as a third component of the Polish–Lithuanian Commonwealth, but civil conflict and renewed war frustrated the settlement. In 1663 Ivan Briukhovetsky became hetman of left-bank Ukraine and moved his residence to Hadiach. From here he received envoys and directed the affairs of a divided Hetmanate until his death in 1668.