Dublin Castle Ireland (1800–1922). After the signing of the Anglo-Irish Treaty in December 1921, the complex was ceremonially handed over to the newly formed Provisional Government led by Michael Collins. It now hosts the inauguration of each President of Ireland, and various State receptions. The castle was built by the dark pool ("Dubh Linn") which gave Dublin its name. This pool lies on the lower course of the River Poddle before its confluence with the River Liffey; when the castle was built, the Liffey was much wider, and the castle was effectively defended by both rivers. The Poddle today runs under the
Christianity in Ireland Dublin: within the walls of the old city is Christ Church Cathedral, the seat of the Archbishop of Dublin, and just outside the old walls is St. Patrick's Cathedral, which the church designated as a National Cathedral for Ireland in 1870. Cathedrals also exist in the other dioceses. The church operates a library and seminary, the Church of Ireland Theological College, in Rathgar, in the south inner suburbs of Dublin. The church's central offices are in Rathmines, adjacent to the Church of Ireland College of Education. The Church in 1999 voted to prohibit the flying of flags other than the