Treaty of Hadiach
With the 1569 (Union of Lublin), when the Polish–Lithuanian Commonwealth was established, the Lithuanian-controlled lands of the Kyiv region (Podolia, Volhynia, and Podlachia) were transferred from the Grand Duchy of Lithuania to the Crown of the Kingdom of Poland, and Kyiv became the capital of Kyiv Voivodeship. The 1658 Treaty of Hadiach envisaged Kyiv becoming the capital of the Grand Duchy of Rus' within the Polish–Lithuanian–Ruthenian Commonwealth, but this provision of the treaty never went into operation. Occupied by the Russian troops since the 1654 Treaty of Pereyaslav, Kyiv became a part of the Tsardom of Russia from 1667 on the Truce of Andrusovo and enjoyed a degree of autonomy. None of the Polish-Russian treaties concerning Kyiv have ever been ratified. In the Russian Empire, Kyiv was a primary Christian centre, attracting pilgrims, and the cradle of many of the empire's most important religious figures, but until the 19th century, the city's commercial importance remained marginal.