 Within the mostly Roman Catholic Polish state, the native Orthodox population and Church of the former lands of Ruthenia were pressured to transfer their allegiance from the Patriarch of Constantinople to the Pope of Rome.Between 1595-1596, the Union of Brest saw the creation of the Uniate Church (later the Ukrainian Greek Catholic Church) in Ruthenia.Like other Eastern Catholic Churches, the Uniate Church maintained the liturgical, theological and devotional traditions of the Orthodox Church despite its new allegiance to Rome.