1870, the year the name ROMAN CATHOLIC CHURCH became the official name

The Roman Catholic Church” by a Catholic Priest Edward k. Taylor

“ Catholic… was first used by St, Ignatius , bishop of Antioch in Syria who was martyred about 110 A.D.

“ The Church founded by Christ is here , for the first time , Called the Catholic Church ,…. It was to stress the unity of the universal Church that ST. IGNATIUS INVENTED THE NAME.