Arthur Wellesley, the fourth son of the Earl of Mornington, later a Field Marshal (1813), then 1st Duke of Wellington (1814) and British prime minister, is said to have been born there, though other sources suggest he was born in the family's country seat, Dangan Castle, near Summerhill, County Meath.
His mother gave 1 May as his birthday, and he himself so kept it, but the nurse affirmed that he was born on 6 March at Dangan Castle, Co. Meath.
The plain exteriors rely for effect on the carefully worked out classical proportions of the timber sash windows and their relation to the whole façade.
Here the main stair hall and the principal reception rooms have much lighter detailing, in the neo-classical, Adam style.
In the midst of this lighter decoration, there are examples of heavier detail, such as the intricate Corinthian cornice in the stairwell and the third floor room with coved ceilings and dramatic rococo plasterwork.