The Union of Brest (Belarusian: Берасцейская унія, romanized: Berascejskaja unija; Lithuanian: Bresto unija; Polish: Unia brzeska; Ukrainian: Берестейська унія, romanized: Berestejśka unija) was the 1595-96 decision of the Ruthenian Orthodox Church eparchies (dioceses) in the Polish–Lithuanian Commonwealth to break relations with the Eastern Orthodox Church and to enter into communion with, and place itself under the authority of the Pope of Rome. The Eparchy of Mukachevo that was located in the Kingdom of Hungary was left out of the process. The union established the Ruthenian Uniate Church, which currently exists as the Ukrainian Greek Catholic Church, and the Belarusian Greek Catholic Church.