The second volume of carpathianist historian Alexey Petrov’s work “Materials for the History of Hungarian Rus’”. This volume describes the early days of the Uniate faith in the Carpathian region and its relation to the original “Old Faith” of Orthodox Christianity which is often called the “ancestral” or more literally the “faith of the fathers [of the people]”. It critically analyzes the Union as not only having been conducted without having asked the people, but as simply being a stepping stone to Roman Catholicism and placing the Ruthenians in an inferior position in relation to the Roman Catholic rulers. The work in particular analyzes the Union of Uzhhorod and the Uniate Eparchies which sprang from it during the 17th and 18th centuries.