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
County Dublin County Dublin County Dublin ( or "Contae Átha Cliath") is one of the thirty-two traditional counties of Ireland. It is no longer used as an administrative division for local government but retains a strong identity in popular culture. It is conterminous with the Dublin Region and is in the province of Leinster. It is named after the city of Dublin, which is the regional capital and the capital city of Ireland. County Dublin was one of the first parts of Ireland to be shired by John, King of England following the Norman invasion of Ireland. Prior to 1994 County Dublin