Roman Catholic Diocese of Trier

This article is about the modern diocese. For the former electoral state, see Electorate of Trier.
Diocese of Trier
or Treves

Dioecesis Trevirensis
Bistum Trier

Trier Cathedral
Country Germany
Ecclesiastical province Cologne
Metropolitan Cologne
Area 12,870 km2 (4,970 sq mi)
- Total
- Catholics
(as of 2010)
1,504,500 (61%)
Denomination Roman Catholic
Rite Roman Rite
Established 1st Century
Cathedral Trier Cathedral
Patron saint Mary, Mother of God
St. Matthew the Apostle
Current leadership
Pope Francis
Bishop Stephan Ackermann
Bishop of Trier
Metropolitan Archbishop Rainer Maria Woelki
Auxiliary Bishops Robert Brahm, Jörg Michael Peters
Emeritus Bishops Leo Schwarz, Alfred Kleinermeilert

The Roman Catholic diocese of Trier, in English traditionally known by its French name of Treves, is a diocese of the Latin Rite of the Roman Catholic church in Germany.[1][2] When it was the archbishopric and Electorate of Trier, it was one of the most important states of the Holy Roman Empire, both as an ecclesiastical principality and as a diocese of the church. Unlike the other Rhenish dioceses — Mainz and Cologne, Trier was the former Roman provincial capital of Augusta Treverorum. Given its status, Trier has always been the seat of a bishop since Roman times, one of the oldest dioceses in all of Germany. The diocese was elevated to an Archdiocese in the time of Charlemagne and was the metropolitan for the dioceses of Metz, Toul, and Verdun. After the victory of Napoleon Bonaparte of France, the archdiocese was lowered to a diocese and is now a suffragan of the Archdiocese of Cologne. The diocesan cathedral is the Cathedral of Saint Peter.


  The archdiocese of Trier in 1500

The bishops of Trier were already virtually independent territorial magnates in Merovingian times. In 772 Charlemagne granted Bishop Wiomad complete immunity from the jurisdiction of the ruling count for all the churches and monasteries, as well as villages and castles that belonged to the Church of St. Peter at Trier. In his will he also elevated the diocese to the Archdiocese of Trier, with suffragans on both sides of the Rhine. This arrangement lasted over a thousand years.

In Early Modern times, the archdiocese of Trier still encompassed territory along the Moselle River between Trier, near the French border, and Koblenz on the Rhine. The Archbishop of Trier, as holder of an imperial office was traditionally an Imperial Elector of the German king. The purely honorary office of Archchancellor of Gaul arose in the 13th century. In this context that was taken to mean the Kingdom of Arles, or Burgundy, technically from 1242 and permanently from 1263, and nominally until 1803. Arles along with Germany and Italy was one of the three component kingdoms of the Empire.

The last elector removed to Koblenz in 1786. From 1795, the territories of the Archbishopric on the left bank of the Rhine — which is to say almost all of them — were under French occupation, and were annexed in 1801 and a separate bishopric established (later assuming control of the whole diocese in 1803). In 1803, what was left of the Archbishopric was secularized and annexed by the Princes of Nassau.


Before 1000

1000 to 1200

1200 to 1500

Archbishop-Electors of Trier

1500 to 1800

After 1800

Bishops of Trier

Auxiliary bishops

See also


  1. "Diocese of Trier" David M. Cheney. Retrieved February 29, 2016
  2. "Diocese of Trier" Gabriel Chow. Retrieved February 29, 2016
  3. Bistum Trier - Bistum - Geschichte/Bischöfe
  4. Because Folmar was never formally installed in the see, he is often omitted (as is Rudolf of Wied) from official lists of the Bishops of Trier, e.g., the list displayed in Trier Cathedral.
  5. From 1801, after the French conquest of the Imperial territories on the left-bank of the Rhine, Clemens Wenzel of Saxony was archbishop with effect on the right bank only.
  6. "Bishop Johann von Eindhoven, C.R.S.A." David M. Cheney. Retrieved August 6, 2016
  7. "Bishop Johannes von Helmont, O.S.B." David M. Cheney. Retrieved August 28, 2016
  8. "Bishop Johannes Enen" David M. Cheney. Retrieved August 6, 2016
  9. "Bishop Nikolaus Schienen" David M. Cheney. Retrieved August 29, 2016
  10. "Bishop Gregor Helfenstein" David M. Cheney. Retrieved August 29, 2016
  11. "Bishop Johannes Holler" David M. Cheney. Retrieved August 29, 2016


Coordinates: 49°45′22″N 6°38′35″E / 49.75611°N 6.64306°E / 49.75611; 6.64306

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