The Diocese and Prince-bishopric of Schwerin was a Catholic diocese in Schwerin, Mecklenburg, in Germany. The first registered bishop was ordained in the diocese in 1053, and the diocese ceased to exist in 1994.

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The bishops of the Roman Catholic diocese of Schwerin (German: Bistum Schwerin), a suffragan of the Metropolitan Archdiocese of Bremen, were simultaneously secular (political) rulers of princely rank (prince-bishop) in the Prince-Bishopric of Schwerin (Hochstift Schwerin); established 1180 and secularised in 1648), an imperially immediate state of the Holy Roman Empire. Schwerin was the seat of the chapter, Schwerin Cathedral and residence of the bishops until 1239. In 1180 a prince-episcopal residence was established in Bützow, which became the main residence in 1239.

Titulature of the Schwerin bishops

Not all incumbents of the Schwerin see were imperially invested with princely temporal power as Prince-Bishops and not all were papally confirmed as bishops. In 1180 part of the Schwerin diocesan territory was disentangled from the Duchy of Saxony and became an own territory of imperial immediacy called Prince-Bishopric of Schwerin, an imperially immediate feudal member state of the Holy Roman Empire like many prince-prelatures.

The prince-bishopric was an elective monarchy, with the ruling prince being the respective bishop usually elected by the Cathedral chapter, and confirmed by the Holy See, or exceptionally only appointed by the Holy See. Papally confirmed bishops were then invested by the emperor with the princely regalia, thus the title prince-bishop. However, sometimes the respective incumbent of the see never gained a papal confirmation, but was still invested the princely regalia. Also the opposite occurred with a papally confirmed bishop, never invested as prince. A number of incumbents, elected by the chapter, neither achieved papal confirmation nor imperial investiture, but as a matter of fact nevertheless de facto held the princely power. From 1532 to 1648 all incumbents were Lutherans.

The respective incumbents of the see bore the following titles:

• Bishop of Mecklenburg until 1162
• Bishop of Schwerin 1162 to 1181
• Prince-Bishop of Schwerin from 1181 to 1516, except o the years of 1474 to 1479 and 1506 to 1508
• Administrator of the Prince-Bishopric of Schwerin 1474 to 1479, 1506 to 1508, and again 1516 to 1648. Either simply de facto replacing the Prince-Bishop or lacking canon-law prerequisites the incumbent of the see would officially only hold the title administrator (but nevertheless colloquially referred to as Prince-Bishop).

Catholic Prince-Bishops (1181–1474)

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Roman Catholic Prince-Bishops of Schwerin (1181–1474)
Reign and episcopate	Portrait	Name	Birth and death with places	Reason for end of office	Notes
1162–1191		Berno of Amelungsborn	*unknown – 14 January 1191*	death	Apostle of the Obotrites, gained princely power in part of his diocese by 1181 on the carve-up of Saxony
1191–1238		Brunward
1191–1195		Hermann of Hagen			anti-bishop
1238–1240		Frederick of Hagen as Frederick I
1240–1247		Dietrich
1247–1249		William
1249–1262		Rudolph I	*unknown – 1262*	death
1263–1291		Hermann of Schladen as Hermann I
1292–1314	left image	Godfrey von Bülow as Godfrey I (Bülow family)	*unknown – 1314*	death	uncle of Henry I and Ludolph
1315–1322		Hermann von Maltzan as Hermann II
1322–1331		Johann Gans zu Putlitz as John II (Gans zu Putlitz)
1331–1339	left image	Ludolph von Bülow (Bülow family)	*before 1298 – 23 April 1339*, Warin	death	nephew of Godfrey I, brother of the next, uncle of Frederick II
1339–1347	right image	Henry von Bülow as Henry I (Bülow family)	*unknown – 1347*	death	brother of the former, nephew of Godfrey I, uncle of Frederick II
1347–1348		Willekin Pape
1348–1356		Andrew of Wislica
1356–1363		Albert of Sternberg German: Albrecht	*c. 1333 – 14 January 1380*, Litomyšl	became Bishop of Litomyšl	also Bishop of Litomyšl (1364–1368, and again 1371–1380), Prince-Archbishop of Magdeburg (1368–1371)
1363–1365		Rudolph of Anhalt as: Rudolph II (House of Ascania)	*unknown – 1365*, Coswig in Anhalt	death	son of Albert II, Prince of Anhalt-Zerbst
1366–1377	right image	Frederick von Bülow as: Frederick II (Bülow family)	*unknown – 1366*	death	nephew of Ludolph and Henry I
1377–1381		Melchior of Brunswick and Lunenburg, Grubenhagen line (House of Welf)	*1341 – 6 June 1384*		before Prince-Bishop of Osnabrück (1369–1375); rivalled in Schwerin by anti-bishop Marquard in 1377/1378
1377–1378		Marquard Bermann			anti-bishop
1381–1390		John Potho of Pothenstein also: Pottenstein as John III	*unknown – 1390*	death	before Prince-Bishop of Münster (1379–1382) appointed only, de facto he could not prevail over his rivals in Schwerin
1381–1388		Johann Junge as John IV			anti-bishop
1381–?		Gerard of Hoya (Counts of Hoya)			anti-bishop
1390–1415		Rudolf of Mecklenburg-Stargard as: Rudolph III (House of Nikloting)	*unknown – 1415*	death	before Bishop of Skara (1387–1391), son of John I, Duke of Mecklenburg-Stargard
1416–1418		Henry of Nauen as Henry II
1419–1429		Henry of Wangelin as Henry III
1429–1444		Hermann Köppen as Hermann III	*unknown – 3 January 1444*	death
1444–1457		Nicholas Bödeker as Nicholas I
1458		Godfrey Lange as Godfrey II
1458–1473		Werner Wolmers

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Catholic Administrators and Prince-bishops (1474–1532)

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Catholic Administrators and Prince-Bishops (1474–1532)
Reign and episcopate	Portrait	Name	Birth and death with places	Reason for end of office	Notes
1474–1479		Balthasar of Mecklenburg (House of Nikloting)	*1451 – 16 March 1507*, Wismar	resigned tired from pursuing investiture, turned secular	before Administrator of the Prince-Bishopric of Hildesheim (1471–1474); only administrator, never invested bishop; since duke in Mecklenburg-Schwerin, co-ruling with his brother Magnus II
1479–1482		Nicholas of Pentz as Nicholas II
1482–1503		Conrad Loste
1504–1506		John Thun as John V
1504		Reimar von Hahn (Hahn family)			anti-bishop
1506–1508		Ulrich von Malchow			only administrator, never invested as bishop
1508–1516		Petrus Wolkow
1516–1522		Zutpheld Wardenberg			only administrator for the minor Magnus, also Dean (Domdechant) of Schwerin Cathedral
1522–1532		Heinrich Banzkow also: Banzcow or Bantzkow	*before 1499–1540*	resigned when Magnus came of age	only administrator for the minor Magnus, never pursued investiture as bishop; also provost of Hamburg Cathedral

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Due to the Reformation, the Catholic diocese was suppressed in 1555, without formal successor.

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After a century and a half of abandonment, the Catholics on the territory were merely taken care of as missionary, part of the vast Apostolic Vicariate of the Northern Missions of Northern Germany, the first post-Reformatory parish having been established in 1709 (St. Anna, Schwerin).

Since 1930, the Catholic parishes in the former diocese of Schwerin (and all of Mecklenburg) were part of the Roman Catholic Diocese of Osnabrück.

However, Mecklenburg Soviet occupation zone, whereas Osnabrück was in the British occupation zone (i.e. in the other half of partitioned Germany, and of the political world during the Cold War), so the Bishop of Osnabrück appointed an episcopal commissary. Since 1959, the Osnabrück diocese posted an auxiliary bishop in Schwerin, responsible for Mecklenburg's Catholic parishes :

• Bernhard Schräder, first 1946 – 1959 episcopal commissary for the episcopal commissariate of Schwerin, then 1959 – 1971 auxiliary bishop of Osnabrück diocese for the episcopal commissariate in Schwerin.
• 1971 – 1973 (see below): Heinrich Theissing, coadjutor of Osnabrück diocese for the episcopal commissariate in Schwerin

On July 23, 1974, the jurisdiction was restored as pre-diocesan 'permanent' Apostolic Administration of Schwerin, its territory being formally split off from the Diocese of Osnabrück. It got two episcopal incumbents :

• Heinrich Theissing, Apostolic Administrator (July 23, 1973– retired December 5, 1987) with episcopal rights of a residing bishop for the episcopal office in Schwerin; Titular Bishop of Mina (March 13, 1963 – death November 11, 1988), first as Auxiliary Bishop of the Roman Catholic Diocese of Berlin (March 13, 1963 – February 12, 1970), then as Coadjutor Bishop of Schwerin (February 12, 1970 – July 23, 1973), finally an emeritate
• Theodor Hubrich, Apostolic Administrator (1987.11.23 – death 1992.03.26) with episcopal rights of a residing bishop for the episcopal office in Schwerin; previously Titular Bishop of Auca (1975.12.05 – 1987.11.23) as Auxiliary Bishop of Magdeburg (Germany) (1975.12.05 – 1987.11.23).

The diocese was suppressed on October 10, 1994, its territory reassigned to the already established Metropolitan Roman Catholic Archdiocese of Hamburg, thus the Catholic parishes of Mecklenburg became part of the new Roman Catholic Archdiocese of Hamburg.

• 1992–1994 Norbert Werbs, diocesan administrator for the episcopal office in Schwerin
• Since 1994 : Norbert Werbs, auxiliary bishop of the Archdiocese of Hamburg for the archiepiscopal office in Schwerin, also episcopal vicar for Mecklenburg

• List of Catholic dioceses in Germany