Founded in the 4th century as the diocese of Mainz. Elevated to an archdiocese in 747. Re-designated as a diocese on 29 November 1801. Suffragen of the archdiocese of Freiburg im Breisgau. Notable bishops include Saint Arnulf Saint Aureus Saint Bardo Saint Boniface Saint Rabanus Maurus Saint Willigis See also Catholic-Hierarchy.Org diocese of Mainz patron saints index New Catholic Dictionary
