St. Louis Cathedral, New Orleans in the context of The Presbytère

Louisiana (Spanish: Luisiana, [la lwiˈsjana]) was a province of New Spain from 1762 to 1801. It was primarily located in the center of North America encompassing the western basin of the Mississippi River plus New Orleans. The area had originally been claimed and controlled by France, which had named it La Louisiane in honor of King Louis XIV in 1682. Spain secretly acquired the territory from France near the end of the Seven Years' War by the terms of the Treaty of Fontainebleau (1762). The actual transfer of authority was a slow process, and after Spain finally attempted to fully replace French authorities in New Orleans in 1767, French residents staged an uprising which the new Spanish colonial governor did not suppress until 1769. Spain also took possession of the trading post of St. Louis and all of Upper Louisiana in the late 1760s, though there was little Spanish presence in the wide expanses of what they called the "Illinois Country".

New Orleans was the main port of entry for Spanish supplies sent to American forces during the American Revolution, and Spain and the new United States disputed the borders of Louisiana and navigation rights on the Mississippi River for the duration of Spain's rule in the colony. New Orleans was devastated by large fires in 1788 and 1794 which destroyed most of the original wooden buildings in what is today the French Quarter. New construction was done in the Spanish style with stone walls and slate roofs, and new public buildings constructed during the city's Spanish period include several still standing today such as the St. Louis Cathedral, the Cabildo, and the Presbytere.

The Archdiocese of New Orleans (Latin: Archidioecesis Novae Aureliae; French: Archidiocèse de la Nouvelle-Orléans; Spanish: Arquidiócesis de Nueva Orleans) is a Latin Church ecclesiastical division of the Catholic Church spanning Jefferson (except Grand Isle), Orleans, Plaquemines, St. Bernard, St. Charles, St. John the Baptist, St. Tammany, and Washington civil parishes of southeastern Louisiana. It is the second to the Archdiocese of Baltimore in age among the present dioceses in the United States, having been elevated to the rank of diocese on April 25, 1793, during Spanish colonial rule.

Its patron saints are the virgin Mary under the title of Our Lady of Prompt Succor and St. Louis, King of France, and Cathedral Basilica of Saint Louis is its mother church with St. Patrick's Church serving as a pro-cathedral. The archdiocese has 137 church parishes administered by 387 priests (including those belonging to religious institutes), 187 permanent deacons, 84 brothers, and 432 sisters. There are 372,037 Catholics on the census of the archdiocese, 36% of the total population of the area. The current head of the archdiocese is Archbishop Gregory Michael Aymond.

The Cathedral of San Carlos Borromeo (Spanish: Catedral de San Carlos Borromeo), also known as the Royal Presidio Chapel, is a Catholic cathedral located in Monterey, California, United States. The cathedral is the oldest continuously operating parish and the oldest stone building in California. It was built in 1791-94 making it the oldest (and smallest) serving cathedral in the United States, along with St. Louis Cathedral in New Orleans, Louisiana. It is the only existing presidio chapel in California and the only existing building in the original Monterey Presidio.