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
Province of Dublin (Church of Ireland) Province of Dublin (Church of Ireland) The United Provinces of Dublin and Cashel, commonly called the Province of Dublin, and also known as the "Southern Province", is one of the two ecclesiastical provinces that together form the Church of Ireland; the other is the Province of Armagh. The province has existed since 1833 when the ancient Province of Dublin was merged with the Province of Cashel. Its metropolitan bishop is the Archbishop of Dublin. The province has five dioceses; The province covers approximately the southern half of the island of Ireland, including the counties of Meath, Westmeath, Dublin, Kildare, Offaly,