High Quality Content by WIKIPEDIA articles! The Cathedral Basilica of Saint Louis, also known as the Saint Louis Cathedral or the New Cathedral, is a cathedral of the Roman Catholic Church located in the Central West End area of St. Louis, Missouri. Completed in 1914, it is the mother church of the Archdiocese of St. Louis and the seat of its archbishop, currently Robert James Carlson. The cathedral is named for Saint Louis and was designated a basilica by Pope John Paul II in 1997.