The pro-Cathedral is known as St. Mary's pro-Cathedral. It is on Marlborough Street, near O'Connell Street, which is Dublin's main street. Although it has similar columns on the front of it, it is not the GPO (General Post Office) which is on O'Connell Street.
The pro-Cathedral is Catholic, but it is not a full Cathedral. Dublin has two Cathedrals: St. Patrick's Cathedral and Christchurch Cathedral, both of which are Church of Ireland, which is Protestant. St. Patrick's is the national Cathedral and Christchurch is the city Cathedral. Both pre-date the reformation, but became Protestant under Henry VIII in the 1530s and have remained so ever since. As Christchurch retains the status of the city Cathedral, then the pro-Cathedral is not a full cathedral, hence the name. It is not very large and not even the largest Catholic church in the diocese of Dublin. Many other catholic churches in Dublin are bigger. Below you will find photos of the pro-Catherdral, Christchurch Cathedral, St. Patrick's Cathedral and also the GPO.
