Leinster House which means "Teach Laighean" in Irish is the name of the building housing the Oireachtas, the national parliament of Ireland. Leinster House, planned by Architect Richard Cassels, was first constructed in 1745–48 by James, Earl of Kildare. It was situated on the old-fashioned and secluded south side of the city, far from the main locations of aristocratic high-rises north of the Liffey. When the Earl was made Duke of Leinster the residence was renamed Leinster house. In the account of aristocratic residences in Dublin, no other mansion matched Kildare House for its pure size or class.