Old Catholic Church
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The Old Catholic Church, Old Catholics, Old-Catholic churches, or Old Catholic movement are "any of the groups of Western Christians who believe themselves to maintain in complete loyalty the doctrine
Old Catholic parish church in Gablonz an der Neiße, Austria-Hungary (now Jablonec nad Nisou, Czech Republic). Some ethnic German Catholics supported Döllinger in his rejection of the Roman Catholic dogma of papal infallibility.
First Vatican Council
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The First Ecumenical Council of the Vatican, commonly known as the First Vatican Council or Vatican I, was the 20th ecumenical council of the Catholic Church, held three centuries after the preceding
Old Catholic Church
…believe themselves to maintain in complete loyalty the doctrine and traditions of the undivided church but who separated from the See of Rome after the First Vatican Council of 1869–70". The expression "Old Catholic" has been used from the 1850s by communions separated from the Roman Catholic Church over certain doctrines…
Window in Domalain, Brittany, showing the Proclamation of Papal Infallibility
Catholic ecclesiastics from various countries gathered in Rome for the council
Drawing showing the First Vatican Council
Medal marking Vatican I