 St. Stephan is the oldest Gothic hall church in the Upper Rhine district, and is (besides Mainz Cathedral) the most important church in the city of Mainz.Only a few changes have been made to the church since the 14th century.The cloister, for instance, was added between 1462 and 1499 to the southern side of the church, and the outer face of the church was updated during the Baroque period.