The Roman Catholic Archdiocese of New Orleans, officially in Latin Archidioecesis Novae Aureliae, is an ecclesiastical division of the Roman Catholic Church administered from New Orleans, Louisiana. It is the second-oldest diocese in the present-day United States, having been elevated to the rank of diocese on April 25, 1793, by Pope Pius VI during Spanish colonial rule. Our Lady of Prompt Succor and St. Louis, King of France are the patron saints of the Archdiocese and Cathedral Basilica of Saint Louis is its mother church as St.