The Basilica of St. Castor ( or "Kastorkirche") is the oldest church in Koblenz in the German state of Rhineland Palatinate. It is located near Deutsches Eck at the confluence of the Rhine and the Moselle. A fountain called "Kastorbrunnen" ("Castor well") was built in front of the basilica during Napoleon’s invasion of Russia in 1812. Pope John Paul II raised St. Castor to a basilica minor on 30 July 1991. This church is worth seeing for the historical events that have occurred in it, its extensive Romanesque construction and its largely traditional furnishings.