Catholic.
Catholics.
The main religion in 11th century England was Christianity. You can see many examples Christianity had on 11th century England through the many cathedrals introduced during this time including: York Minster Durham Cathedral, Canterbury Cathedral, Lincoln Cathedral, and Wells Cathedral.
Roman Catholic.
The word sought may be "cathedral" (a church).
Usually a cathedral.
Arthur Clutton-Brock has written: 'The cathedral church of York' 'Essays on religion' 'Essays on art'
there are 4 Cathedrals in London Westminster cathedral Southwark Cathedral St. George Cathedral St. Paul's Cathedral
London has many cathedrals, including St Paul's Cathedral, Westminster Cathedral, Southwark Cathedral and St George's Cathedral.
A cathedral
In terms of religion, it is the Catholic Church. In terms of a building Saint Patrick's Catholic Cathedral in Armagh would be the main church.
The widest cathedral in the UK is Liverpool Cathedral.