Catholic Church in Ireland
In the 2016 Irish census 78.3% of the population identified as Catholic in Ireland; numbering approximately 3.7 million people. Unlike Catholics in the United States, Ireland has seen a significant decline from the 84.2% who identified as Catholic in the 2011 census.
St Canice's Cathedral
Following the English Reformation, the reformed church in Ireland was established by decree of the Irish Parliament to become the state church in the Kingdom of Ireland as the Church of Ireland, taking possession of most church property (and so retaining a great repository of religious architecture and other items, though some were later destroyed). The substantial majority of the population, however, remained faithful to Roman Catholicism, despite the political and economic advantages of membership in the state church. Since St Canice's Cathedral was taken over in this way, Roman Catholic adherents were consequently obliged to worship elsewhere. St Mary's Cathedral in Kilkenny was later built for the Roman Catholic diocese.