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
Ballyroan, Dublin the area. Ballyroan, Dublin Ballyroan () is a suburb in Rathfarnham, County Dublin in Ireland. It lies at the foot of the Dublin mountains, alongside Ballyboden, Butterfield, Knocklyon, Old Orchard, and Scholarstown. The townland of Ballyroan crosses civil parish and barony boundaries with roughly 114 acres of the historical townland in the civil parish of Tallaght in the barony of Uppercross, and nearly 10 acres in the civil parish of Rathfarnham in the barony of Rathdown. The modern suburb of Ballyroan has extended somewhat beyond the traditional townland boundaries. The centre of Ballyroan contains the Rosemount shopping centre, the parish