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
Newcastle, South Dublin Newcastle, South Dublin Newcastle () is a village in south-west South Dublin, Ireland. It is also a civil parish in the barony of the same name. It was the location of the castle of the barony, which in historical and official documents is described as Newcastle-Lyons. The area is still primarily rural in nature. Newcastle-Lyons is located at the junction of the R120 and the R405 regional roads. It lies approximately 3 km north of the N7 at Rathcoole, 6 km south east of Celbridge, and 9 km west of Tallaght. The village lies west of Casement Aerodrome (Baldonnell), the