The Diocese of Mainz is a diocese of the Catholic church in Germany The diocese was created in 1802 with the abolition of the old Archbishopric of Mainz. In many rites of the Roman Catholic Church and in Anglican churches, a diocese is an administrative territorial unit administered by a Bishop. Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. Year 1802 ( MDCCCII) was a Common year starting on Friday of the Gregorian calendar or a Common year starting on Wednesday of the The Archbishopric of Mainz (Erzbistum Mainz or Electorate of Mainz (Kurfürstentum Mainz or Kurmainz) was an influential ecclesiastic and secular Prince-bishopric The diocese of Mainz is subordinate to the Archdiocese of Freiburg; its district is located in the states of Rhineland-Palatinate and Hesse. Rhineland-Palatinate (Rheinland-Pfalz is one of the 16 federal states (German Bundesländer) of Germany. Hesse (Hessen is a state of Germany with an area The seat of the diocese is Mainz. Mainz (ˈmaɪ̯nʦ (Mayence is a City in Germany and the capital of the German federal state of Rhineland-Palatinate.