The Diocese of Great Falls-Billings (Latin: Dioecesis Magnocataractensis-Billingensis) is the Catholic diocese of eastern Montana established in 1904.Pope Pius X erected the Diocese of Great Falls on May 18 1904 by dividing the Diocese of Helena which previously comprised the entire state.For its first 76 years it was called the Diocese of Great Falls (Latin: Dioecesis Great-Ormensis). Bishop Thomas J.
