Basilica of Saint Louis, King of France - Credit: Wikimedia Commons
The Basilica of Saint Louis, King of France (), formerly the Cathedral of Saint Louis, and colloquially the Old Cathedral, is a Catholic church in St. Louis, Missouri. It was the first cathedral west of the Mississippi River and until 1844 the only parish church in St. Louis. It is one of two Catholic basilicas in St. Louis (with the current cathedral) and both are named for King Louis IX of France (the namesake of the city).Conard, p. 528 Read more on Wikipedia
Source: en.wikipedia.org