Union of Utrecht (Old Catholic)

The Union of Utrecht of the Old Catholic Churches, most commonly referred to by the short form Union of Utrecht (UU), is a federation of Old Catholic churches, nationally organized from schisms which rejected Roman Catholic doctrines of the First Vatican Council in 1870; its member churches are not in communion with the Roman Catholic Church. The 1889 Declaration of Utrecht is one of three founding documents together called the Convention of Utrecht.

Source: Wikipedia — Union of Utrecht (Old Catholic) (CC BY-SA 4.0)