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
Oldtown, Dublin Oldtown, Dublin Oldtown () is a population centre and townland in the civil parish of Clonmethan in Fingal, Ireland. The R122 road runs through the village linking Naul to St Margaret's and Dublin Airport. The character of the landscape is "Low-Lying Agricultural", as indicated in the County Development Plan. This area contains mixed pasture and arable farming on low lands, consisting of large fields with few tree belts or large settlements with few panoramic views or prospects. The village itself is situated in a shallow valley drained by a small river known locally as ‘The Daws River’ and is surrounded