Гадячский договор
Treaty of Chudnov or Treaty of Cudnów (, ) was a treaty between the Polish–Lithuanian Commonwealth and the Cossacks, signed in Chudniv (Polish: Cudnów) on 17 October 1660 during the Chmielnicki Rebellion. It restored most of the provisions of the Treaty of Hadiach, except for the elevation of Ruthenia to the status equal of the Poland and Lithuania. It invalidated the Pereyaslav Articles.