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Aco-cathedral is acathedral church which shares the function of being abishop's seat, orcathedra, with another cathedral, often in another city (usually a former see, anchor city of the metropolitan area or the civil capital). Instances of this occurred in England before theProtestant Reformation in thedioceses of 'Bath andWells', and of 'Coventry andLichfield'. These two dioceses were each named for both cities that served as bishop's seats.
As of March 2020, the Catholic Church had 322 co-cathedrals, mainly in Europe (140 in Italy alone).[1]
Many are former cathedrals, but even if still in use, those often are not granted co-cathedral status.
Often the diocese with one or more co-cathedrals also has a multiple ("hyphenated") name reflecting these, but some have a co-cathedral not mentioned in the title while other former see titles may also be preserved without having a co-cathedral. Sometimes the first-named city does not have the main cathedral (actual see) but boasts another distinction such as being a national capital or having an august ecclesiastical past.
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In Albania, theRoman Catholic Archdiocese of Tirana-Durrës has a co-cathedral inDurrës, Saint Lucia co-cathedral.

In Belgium, the cathedral of theprimatialRoman Catholic Archdiocese of Mechelen-Brussels is the MetropolitanSt. Rumbold's Cathedral inMechelen (Malines), the archiepiscopal seat. Its co-cathedral is theCathedral of St. Michael and St. Gudula inBrussels, the national capital. A third, larger church in Koekelberg (also in Brussels) has the status ofminor basilica, without co-cathedral rank, yet it has received papal visits including a papal beatification.
TheRoman Catholic Diocese of Sofia and Plovdiv has, besides the Cathedral of St Louis inPlovdiv, a new co-cathedral of St. Joseph inSofia.
TheRoman Catholic Diocese of Ostrava-Opava has a co-cathedral of Our Lady of the Assumption Co-Cathedral in Ostravian-Opavian diocese in Opava besides the Ostrava Savior cathedral.
The primatial Metropolitan see of theRoman Catholic Archdiocese of Esztergom-Budapest has its primary cathedral in the old archiepiscopal seat, the CathedralBasilica of Esztergom, and a co-cathedral basilica in the national state capitalBudapest.


The metropolitan cathedral of theRoman Catholic Archdiocese of Malta isSt. Paul's Cathedral in the former capitalMdina. Since the 1820s, the former Conventual Church of St. John inValletta has been known asSt. John's Co-Cathedral.

Since 8 March 2025, theBasilica of Saint Nicholas, Amsterdam, is co-cathedral with theCathedral of St Bavo, Haarlem.[2]
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The LatinApostolic Vicariate of Alexandria had a St. Catherine cathedral in Alexandria and two co-cathedrals: the former cathedrals of the merged-in apostolic vicariates of Heliopolis of Egypt (Our Lady, in that Cairo suburb) and of Port Said (Our Lady and St. Michael in that Sinai Canal port).
The Diocese of Keta–Akatsi has its co-cathedral at first-namedKeta, the cathedral is in second-namedAkatsi.
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TheArchdiocese of Liverpool includes a co-cathedral on theIsle of Man, theSt. Mary of the Isle Church.
Prior to the Protestant Reformation, the dioceses of 'Bath and Wells' and 'Coventry and Lichfield' were the only co-cathedrals in England.
Only one diocese of theChurch of England has co-cathedrals; in theAnglican Diocese of Leeds there are three co-cathedrals,Ripon,Bradford andWakefield. The Diocese of Leeds was formed in 2014 by the merger of the former Anglican dioceses ofBradford,Ripon, andWakefield, with all three former diocesan cathedrals given co-equal status in the new diocese.[5][6]
In the case ofYork thecollegiate churches ofBeverley,Ripon andSouthwell were almost in the same position, but although the archbishop had a stall in each, he had no diocesan cathedra in them. The chapters were not united with that of the metropolitan church in the direct government of the diocese, or the election of the archbishop, nor had they those other rights which were held to denote the cathedral character of a church.[citation needed]
TheDiocese of Argyll and The Isles of theScottish Episcopal Church has two co-cathedrals:St John's Cathedral,Oban andCathedral of The Isles,Millport, Cumbrae. It is the only diocese to have more than one cathedral.[7]

In theUnited States, there are several instances in which aRoman Catholic diocese maintains twoepiscopal see cities, each with its own cathedral or co-cathedral. Examples include:
In some cases the co-cathedrals are in different municipalities, but the diocese's name does not reflect the dual cathedral status. For example:
There are also three instances in the United States in which a cathedral and its co-cathedral are in the same city.[9] This usually occurs when a historically important cathedral becomes too small to serve a growing population, and a larger co-cathedral is constructed to accommodate larger services. Examples include:
Examples in Canada are:
In theEpiscopal Church in the United States, theDiocese of Iowa and theDiocese of Minnesota each have two cathedrals, both located in different cities; however, they are not styled "co-cathedrals." TheDiocese of Lexington maintains a second cathedral of the Cathedral Church of St. George the Martyr at their Cathedral Domain conference center and camp inIrvine, Kentucky, but they do not use the term "co-cathedral" to describe it.[10]
With Cathedrals in Oban and on the Isle of Cumbrae...
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