Catholic Church in Germany no relation Electorate of Mainz
The Diocese of Mainz, historically known in English as Mentz as well as by its French name Mayence, is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Germany. It was founded in 304, promoted in 780 to Metropolitan Archbishopric of Mainz and demoted back in 1802 to bishopric. The diocese is suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Freiburg. Its district is located in the states of Rhineland-Palatinate and Hesse. The seat of the diocese is in Mainz at the Cathedral dedicated to Saints Martin and Stephen.
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